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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #241  
Old 05-19-2012, 8:14 PM
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Quote:
Originally Posted by FatalKitty View Post
Sounds awesome gp!

I really want my rifle to be coated in a multicam pattern, but im worried i will screw it up.
My ar already has like 4 layers of paint on it LOL
Thanks! This is current config. Like I said, should have the gas block swapped out with an adjustable, the brake swapped out with a shorter Rainier Mini Comp, the rail swapped with a lighter FDE Troy Battlerail Bravo, and the ACOG swapped out with a Vortex SPARC shortly. Should shave another ~18 ounces off the weight. Now to duracoat the upper/lower....

(Range report to follow tomorrow)


Sorry for the crappy picture, my workbench is a mess. Hosted a mini Saiga conversion party this afternoon.

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  #242  
Old 05-26-2012, 12:37 PM
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Finally got it put together.
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  #243  
Old 05-26-2012, 3:49 PM
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Originally Posted by fiddynut View Post
Finally got it put together.
[IMG]http://i13.photobucket.com/albums/a258/fiddynut/4b07f0d6.jpg[IMG]
OMG that thing is SEXY! I love those style rail guards and almost want to get a railed forend just for those, LOL
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  #244  
Old 05-26-2012, 7:01 PM
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Thanks man. Going out Monday morning do dial it all in.
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  #245  
Old 05-31-2012, 12:49 AM
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Thanks to everyone on this thread for the advice on putting together my dissipator. Here she is!



She works flawlessly & I love having the rifle length rails while keeping barrel length to a minimum.
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  #246  
Old 05-31-2012, 11:02 PM
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FYI, spoke with Cathy from Model 1 Sales, they are processing orders from April 17th. I still have about another month till my dissy kit arrives, agghhhhh!
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  #247  
Old 06-01-2012, 3:59 PM
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Originally Posted by operator13 View Post
Thanks to everyone on this thread for the advice on putting together my dissipator. Here she is!



She works flawlessly & I love having the rifle length rails while keeping barrel length to a minimum.
man I miss my MB556k brake. Well not really... it did kill muzzle climb and recoil... BUT it was a PITA for everyone else.
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  #248  
Old 06-03-2012, 3:17 PM
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Has anybody cut down a 20" rifle and changed port sizing? What length was barrel cut to (with threading for muzzle device) and how was the gas port changed?
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  #249  
Old 06-14-2012, 7:35 AM
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Originally Posted by artoaster View Post
Has anybody cut down a 20" rifle and changed port sizing? What length was barrel cut to (with threading for muzzle device) and how was the gas port changed?
I tried e-mailing DPMS to see what size they drilled the ports for their barrels at but never got a response. I don't have the tools to accurately measure the ports either so I can't tell you what to drill it out to.


BTW, anyone questioning the reliability of the dissipator (rifle gas, 16"bbl) system:



thousands of blanks and no malfunctions... anyone that has ever trained with blanks knows that is nothing short of a miracle.
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  #250  
Old 06-14-2012, 11:44 AM
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Originally Posted by FatalKitty View Post
I tried e-mailing DPMS to see what size they drilled the ports for their barrels at but never got a response. I don't have the tools to accurately measure the ports either so I can't tell you what to drill it out to.


BTW, anyone questioning the reliability of the dissipator (rifle gas, 16"bbl) system:



thousands of blanks and no malfunctions... anyone that has ever trained with blanks knows that is nothing short of a miracle.
Weird, what kind of blanks are those? Looks like they have a much longer neck to simulate a bullet than the military/lake city blanks.
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  #251  
Old 06-14-2012, 1:05 PM
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Prvi Partizan

if you're having trouble finding any, it's because we bought them all. LOL
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  #252  
Old 06-20-2012, 8:17 PM
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My build:

*Spikes lower, DPMS upper
*VLTOR Gunfighter CH
*LMT M16 Bolt Carrier Group
*Vltor A5 Stock Kit (Pinned)
*Addax Tactical/Black Hole Weaponry 16", rifle gassed 3 poly rifled stainless steel barrel
*Seekins Precision SAR Rail (12")
*Kies Adjustable Gas Block (Melonite coated)
*Rainier Arms Mini Comp
*Vortex SPARC Red Dot
*Knockoff KAC Handstop
*MIAD Grip with Solar Tactical Wrap

Between the "Full Auto/M16" BCG, the rifle-gassed barrel, the adjustable gas block, the muzzle brake, and the A5 stock kit, this thing shoots like BUTTER.


















Last edited by GettoPhilosopher; 06-24-2012 at 5:24 PM..
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  #253  
Old 06-21-2012, 4:44 PM
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All this post about the Dissipator makes me want to get one. Now the question is, where do I buy a Dissipator upper?
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  #254  
Old 06-21-2012, 4:47 PM
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Palmetto state armory gets my vote
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  #255  
Old 06-21-2012, 6:27 PM
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Originally Posted by stitch_paradox View Post
All this post about the Dissipator makes me want to get one. Now the question is, where do I buy a Dissipator upper?
Love my midlength CHF PSA dissipator upper

Plus, I didn't pay extra for the magpul handguards and they threw them in anyways.
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Last edited by CHS; 06-22-2012 at 9:24 AM..
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  #256  
Old 06-21-2012, 6:31 PM
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PSA is out of stock though
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  #257  
Old 06-22-2012, 6:54 AM
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Hey GettoPhilosopher,


How about some details on your build? Is that a rifle gas system with an 18" bbl?
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  #258  
Old 06-22-2012, 7:58 AM
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I see a lot of "dissipators" in this thread which are not dissipators at all.

A 12" handguard on a 16" barrel is not automaticaly a dissipator.
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  #259  
Old 06-22-2012, 8:01 AM
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Quote:
Originally Posted by artoaster View Post
Hey GettoPhilosopher,


How about some details on your build? Is that a rifle gas system with an 18" bbl?
Build specs are posted a few weeks back. Let me figure out how to link.

It's a rifle gassed 16" bbl.






Quote:
Originally Posted by tuna quesadilla View Post
I see a lot of "dissipators" in this thread which are not dissipators at all.

A 12" handguard on a 16" barrel is not automaticaly a dissipator.
*nods* I know I don't have a FSB, but it is a 16" rifle gassed bbl.

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  #260  
Old 06-22-2012, 12:00 PM
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Just wanted to share the Dissy rifle i have been putting together over the last month.

Its nothing special, very similar to alot of yours with the magpul get up. Anyways, heres the specs:

Bushmaster 16" mock dissipator upper w/ carbine length gas system. MOE Handguard, Miculek Muzzle Brake, Bushnell Trs-25 RDS, and Matech rear Buis.

Ive been searching for a dissy upper for along time. I was ready to buy one and nobody had one available, so i ended up getting a piston upper, shot it once.....wasnt impressed, front got really hot. That same day a guy at the range had a dissy, shot it and loved it. Next day put the piston upper up for sale on the marketplace!

A week later i saw this Bushmaster Dissipator upper FS on the marketplace. I know BM has a bad rap these days but researching it and from what the owner told me was it was a preban upper from the late 90's - early 00's, had a 4150 steel (possibly hammer forged) chrome lined heavy barrel. Back then, bushmaster was one of the few consumer AR manufacturers along with colt, armalite, olympic, etc. They had a better reputation then. Btw, the upper/barrel has ZERO rounds through it!

So i got my rifle together, the upper fits tight on my lower. Its front heavy like alot of other HBAR dissy's, but nothing like my tacticool 20" HBAR A4 style AR. I cant wait to shoot it! With the muzzle brake, i know its gonna be loud! A little gripe i have with it is the upper is a lighter grey color, like older colt uppers, where my yhm lower is a real dark black. You can kinda see it in the picture. Then again, im not going to ceracote the upper and lower until i shoot the rifle alot.....and it needs it!

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  #261  
Old 06-25-2012, 11:46 AM
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Quote:
Originally Posted by tuna quesadilla View Post
I see a lot of "dissipators" in this thread which are not dissipators at all.

A 12" handguard on a 16" barrel is not automaticaly a dissipator.
in the first post I mentioned that I would rather no one got into what a "real dissipator" is

I think we can all agree with modern ARs that functionality can be accomplished many different ways and for the most part a dissipator can be an aesthetics thing

Although I will say that having a freefloat rail all the way down the barrel might not bein keeping with the dissipator style of things, it's still an excellent rifle and does indeed have the longer gas system... so - COOL!

Also, I saw this on M4Cabine.net today... LOL those guys crack me up!



reverse mock dissy! LOLOL
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  #262  
Old 06-25-2012, 8:43 PM
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Quote:
Originally Posted by FatalKitty View Post
in the first post I mentioned that I would rather no one got into what a "real dissipator" is

I think we can all agree with modern ARs that functionality can be accomplished many different ways and for the most part a dissipator can be an aesthetics thing

Although I will say that having a freefloat rail all the way down the barrel might not bein keeping with the dissipator style of things, it's still an excellent rifle and does indeed have the longer gas system... so - COOL!

Also, I saw this on M4Cabine.net today... LOL those guys crack me up!



reverse mock dissy! LOLOL
That..... is very interesting.

I like it!

So it looks like he put an actual handguard end-cap behind the second gas block? Strange! Lack of points for missing BUIS though. If you've got a front iron, you've got to have a BUIS. Come on!

As far as what makes a dissipator, in my opinion it has ALWAYS included a short barrel with a rifle-length standard front sight base.
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  #263  
Old 06-25-2012, 9:04 PM
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Quote:
Originally Posted by CHS View Post
That..... is very interesting.

I like it!

So it looks like he put an actual handguard end-cap behind the second gas block? Strange! Lack of points for missing BUIS though. If you've got a front iron, you've got to have a BUIS. Come on!

As far as what makes a dissipator, in my opinion it has ALWAYS included a short barrel with a rifle-length standard front sight base.
That's exactly what a dissipator is. It's a 16" barrel with a standard FSB affixed to the barrel in the rifle position -- there can be a low pro gas block under the handguards, or the FSB itself can be the gas block. To start a "everything about the dissipator" thread and then state you don't want people to talk about the definition of a dissipator is... a little odd.
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  #264  
Old 06-25-2012, 10:45 PM
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Quote:
Originally Posted by tuna quesadilla View Post
That's exactly what a dissipator is. It's a 16" barrel with a standard FSB affixed to the barrel in the rifle position -- there can be a low pro gas block under the handguards, or the FSB itself can be the gas block. To start a "everything about the dissipator" thread and then state you don't want people to talk about the definition of a dissipator is... a little odd.
talk about it all you want, but I would avoid telling people what their rifle is.

technically "dissipator" is a term coined by Bushmaster - so anything that isn't a slaved gasblocked 16"bbl made by BMA is not a dissy. facts
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  #265  
Old 06-25-2012, 11:08 PM
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Okay fine.

Here's my dissipator.

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  #266  
Old 06-26-2012, 9:45 AM
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that's kind of why I wanted to avoid the argument.... people start getting childish.

I appreciate your other contributions to this thread... so no need to be a sarcastic asshat

I am by no means the expert here... I made this thread out of personal interest in the style, because when I was building mine - there literally NO pictures of them on the internet, it warms my heart now to see so many different interpretations... as the saying goes, there is more than one way to skin a cat!

Here - Stickman Dissy - and a chick



and a BUNCH of M16 configs - including a couple of 605a models


also... airsoft dissy! how cool! haha
http://www.evike.com/product_info.php?products_id=37779

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Last edited by FatalKitty; 06-26-2012 at 9:52 AM..
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  #267  
Old 06-26-2012, 10:01 AM
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that's kind of why I wanted to avoid the argument.... people start getting childish.

BUNCH of M16 configs - including a couple of 605a models

What a BEAUTIFUL Site!
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  #268  
Old 07-10-2012, 4:35 PM
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Stickmans chick reminds me of Carrot Top. Actually took a double take.

Anyways just ordered a DTI Dissy from Midwayusa was trying to hold out on the Spikes at AIM but can't wait anymore.
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  #269  
Old 07-11-2012, 7:29 AM
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Hi all,

I orderd the rifle-length Del Ton upper from MidwayUSA. I'm thinking of setting up a carbine stock on the lower. What's you guys' advice, will the standard carbine buffer cycle correctly, or should I switch it out? Or should I stick to a fixed rifle stock?
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  #270  
Old 07-11-2012, 9:18 AM
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Quote:
Originally Posted by WReyth View Post
Hi all,

I orderd the rifle-length Del Ton upper from MidwayUSA. I'm thinking of setting up a carbine stock on the lower. What's you guys' advice, will the standard carbine buffer cycle correctly, or should I switch it out? Or should I stick to a fixed rifle stock?
I use a carbine H2 buffer - works just fine with all types of ammo (including blanks with a RED BFA.

I would start with a standard buffer and you should be fine!

last weekend: training with blanks... had a minute during a security exorcise to snap a photo (I know I know... bad ... but it was too badass an opportunity to pass up! lol)

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Last edited by FatalKitty; 07-11-2012 at 9:21 AM..
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  #271  
Old 07-11-2012, 11:31 PM
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Just finished mine (well almost...just waiting for my brake to come in).

It's a 20" PSA upper cut down to 16.1" and had the port opened up by Ar15barrels.

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  #272  
Old 07-12-2012, 11:47 PM
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The Del-Ton upper arrived this week, I picked up a carbine stock and buffer kit and put them together last night, took it to the new indoor range today to check the function. Fires and ejects, but fails to feed. It looks like the bolt is not picking up the next round. A few times, the round got caught pinched between the bolt and the feed ramp, like the bolt had caught the body of the cartridge case and pushed it off instead of seating the cartridge head on the bolt face. I tried a different magazine but still same problem. I've used both magazines in my other ARs, so I don't think they are the problem. Same with the lot of ammunition I was shooting.

When I got home, cleaned and inspected it. The function and safety checks look ok, I didn't see anything unusual with the BCG or upper. The buffer seems to move freely an smoothly. My guess is that the bolt is not cycling fully. I'll switch the upper onto my rifle length lower and the lower to my old carbine upper and see what happens. The components on this one are:
*Del-Ton Dissipator A3 Upper Assembly, 5.56 1in9 16" Rifle length Heavy contour barrel Chrom Moly
*JD Machine lower receiver with DoubleStar LPK
*ATI 6-Position Commercial buffer tube kit
*MagPul STR stock with ASAP ring

Last edited by WReyth; 07-13-2012 at 2:38 AM.. Reason: correction
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  #273  
Old 07-13-2012, 8:32 AM
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Sounds under gassed.
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  #274  
Old 07-13-2012, 8:45 AM
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Anyone put together a 7.62 mock or traditional dissipator? I'm curious if cutting a 20" and opening the gas port would be sufficient or simply going the mock dissipator route through a company like model 1 (minus the identity theft of course )

Any thoughts?
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  #275  
Old 07-13-2012, 8:53 AM
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Quote:
Originally Posted by munkeeboi View Post
Sounds under gassed.
--------------------------------------------------------------------------------

Yeah, that's what I' m thinking. I'll see what happens when its on a lower with a rifle buffer. If that's the case I can switch it over or try another buffer like fatalkitty mentioned.
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  #276  
Old 07-13-2012, 1:04 PM
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a heavier buffer will slow the cycle down and allow the gas pressure to build up and cycle the action more reliably. Dont use a rifle buffer in a carbine stock! Buffer length is only dependent on stock length.

To me is sounds under gassed; what ammo are you using? Be sure that bolt carrier assembly is soaking wet with lube... last training even a guy had an ar that would cycle blanks and all we did was oil it... worked flawlessly after that
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  #277  
Old 07-13-2012, 1:27 PM
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Quote:
Originally Posted by FatalKitty View Post
a heavier buffer will slow the cycle down and allow the gas pressure to build up and cycle the action more reliably. Dont use a rifle buffer in a carbine stock! Buffer length is only dependent on stock length.

To me is sounds under gassed; what ammo are you using? Be sure that bolt carrier assembly is soaking wet with lube... last training even a guy had an ar that would cycle blanks and all we did was oil it... worked flawlessly after that
I did some testing, I'll put up what happened when I have more time later.
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Old 07-14-2012, 8:54 PM
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I tried interchanging lowers and uppers to try to isolate the problem.
I have a DoubleStar DS-4 carbine and an A3 pattern build to test with. I shot Lake City bulk reload .223 55g FMJ cartridges out of 10/30 blocked PMags. I've used this lot of ammunition and the magazines for range trips and carbine classes without any problems. I also shot some new PMC Bronze through the Dissipator just in case. The vitals on each:

Dissipator build (Dis)
*Del-Ton Dissipator A3 Upper Assembly, 5.56 1in9 16" Rifle length Heavy contour barrel
*JD Machine lower receiver with DoubleStar LPK
*ATI 6-Position Commercial buffer tube kit
*MagPul STR stock with ASAP ring

DoubleStar DS-4 off the shelf(Car)
*5.56 1in9 16" match barrel w/M-4 cut
*6-Position commercial stock assembly

A3 type build (A3)
*RRA A3 style upper assembly, 5.56 1in9 20" Rifle length heavy contour barrel
*Aero Precision lower receiver with RRA LPK
*RRA Operator A2 fixed stock assembly

I fired around six to eight shots out of each combination, slow then rapid fire. eg, 3 shots slow, reload, 4 shots rapid.

Upper......Lower.....Function
Dis..........A3..........FTF
A3...........Dis.........OK
Dis..........Dis..........FTF
Dis..........Car.........OK
Car..........Dis.........OK
Dis..........Car.........OK
Car..........Dis.........OK
Dis..........A3..........OK
Dis..........Dis..........FTF
A3...........Dis.........OK
Dis..........A3..........FTF
A3...........Dis.........OK
Dis..........Car.........OK

It seems the problem is with the Dissipator upper. The other two work OK on the Dissipator's lower, but the Dissipator upper only seems to work on the DS-4 Lower. Another anomaly I noticed is when firing the A3 upper on the Dissipator lower, the bolt did not hold open after the last round a couple of times.
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  #279  
Old 07-18-2012, 12:18 AM
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FatalKitty FatalKitty is offline
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I don't know how to help you - the fact that it functions with the "CAR" lower is worth something. perhaps experiment (if you can) with different buffer weights.
the barrel should have the gas port already enlarged
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  #280  
Old 07-18-2012, 12:56 AM
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siznarf siznarf is offline
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Quote:
Originally Posted by munkeeboi View Post
Just finished mine (well almost...just waiting for my brake to come in).

It's a 20" PSA upper cut down to 16.1" and had the port opened up by Ar15barrels.

How much did it cost to cut down?

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