COMPLETED: MY SECOND ULTRA LIGHTWEIGHT BUILD = 3lb 15.1oz WITH SIGHT - Page 2

GOLDEN GUN · #41 05-11-2016, 9:10 PM

Quote:

Originally Posted by Checkk

I have 3,000 rounds + through this rifle, never had a problem except for tight fitment with my mag tactical upper and lower.

What's the weight on that bad boy? And what length kmr?

GOLDEN GUN · #42 05-11-2016, 9:11 PM

Quote:

Originally Posted by Pharmboy

Nice build. If you want to add some flavor or challenge, maybe try building a 300BLK or 6.5 Grendel using your current upper/lower/rail. Just a thought.

Lightest .300black out barrel is 24 ounces... I can still have a 4.5lb rifle in .300BLK

Checkk · #43 05-11-2016, 10:10 PM

Quote:

Originally Posted by GOLDEN GUN

What's the weight on that bad boy? And what length kmr?

4.8lbs, KMR is 13" w/ 16" faxon pencil barrel and magpul sights. BCG is aim surplus LW and taccom buffer. I was planning to put the saber tube on there but decide to use it on my new build instead.

GOLDEN GUN · #44 05-12-2016, 9:04 AM

I think I'm going to stick with an adjustable gas block versus the gas key. Reason being id rather limit the gas going down the tube.

Anyone have an opinion on aluminum bolt carriers?

LeadFarmer74 · #45 05-12-2016, 9:11 AM

I would argue against using a mag tactical lower. I had one and it was lightweight but I had one of their proprietary trigger pins break at the range. I sold it off. It's not worth saving an oz or two with this lower. The KMR you have quoted should be a couple more oz's as well.

CheeseCake · #46 05-12-2016, 9:34 AM

There would be a great build

GOLDEN GUN · #47 05-12-2016, 10:26 AM

Quote:

Originally Posted by LeadFarmer74

I would argue against using a mag tactical lower. I had one and it was lightweight but I had one of their proprietary trigger pins break at the range. I sold it off. It's not worth saving an oz or two with this lower. The KMR you have quoted should be a couple more oz's as well.

the kmr with titanium barrel nut is listed at that weight.... i plan on using milsepc pins.. but they brake all the time too

LeadFarmer74 · #48 05-12-2016, 10:28 AM

Quote:

Originally Posted by GOLDEN GUN

the kmr with titanium barrel nut is listed at that weight.... i plan on using milsepc pins.. but they brake all the time too

Hmm I know the regular KMR are hard to find and BCM doesn't even list a non alpha version in 10". The MilSpec pins will be short fitting into that lower.

GOLDEN GUN · #49 05-12-2016, 10:35 AM

Quote:

Originally Posted by LeadFarmer74

Hmm I know the regular KMR are hard to find and BCM doesn't even list a non alpha version in 10". The MilSpec pins will be short fitting into that lower.

yea i found a private party selling one in phoenix arizona brand new which was lucky...

are the mag tactical lowers wider at the pin areas in the fire control pocket? if its the same size pocket they should still work.

LeadFarmer74 · #50 05-12-2016, 10:44 AM

Quote:

Originally Posted by GOLDEN GUN

yea i found a private party selling one in phoenix arizona brand new which was lucky...

are the mag tactical lowers wider at the pin areas in the fire control pocket? if its the same size pocket they should still work.

Very nice pick up then. The mag tact lower does have a wider area in the pins that's why they used proprietary pins. When mine broke I was able to use a regular pin for a short time but lost faith in the lower after that.

GOLDEN GUN · #51 05-12-2016, 10:57 AM

Quote:

Originally Posted by LeadFarmer74

Very nice pick up then. The mag tact lower does have a wider area in the pins that's why they used proprietary pins. When mine broke I was able to use a regular pin for a short time but lost faith in the lower after that.

as long as the width of the pocket is the same it should be fine to use mil spec pins.. v7 weapon systems sells titanium pins that are extended for mag tactical lowers too if i decide i need them

LeadFarmer74 · #52 05-12-2016, 10:59 AM

Quote:

Originally Posted by GOLDEN GUN

as long as the width of the pocket is the same it should be fine to use mil spec pins.. v7 weapon systems sells titanium pins that are extended for mag tactical lowers too if i decide i need them

Sounds like you have it covered but just wanted to put my .02 cents in on my experience. Looking forward to seeing the final product.

GOLDEN GUN · #53 05-12-2016, 11:25 AM

my main concern right now is the aluminum bcg with steel hammer

FaxonFirearms · #54 05-12-2016, 12:11 PM

Quote:

Originally Posted by GOLDEN GUN

my main concern right now is the aluminum bcg with steel hammer

Go the polymer kit from New Frontier Armory?

-Nathan

GOLDEN GUN · #55 05-12-2016, 12:30 PM

i thought about buying just the polymer hammer but I'm curious if Its really necessary

GOLDEN GUN · #56 05-12-2016, 6:43 PM

Weighed the Daniel defense grip today..

With the trigger guard cut off its 3 ounces, same as the ergo... I still may opt for the magpul gen 1 k grip if I can find a black one

Spyder · #57 05-12-2016, 6:47 PM

I've got a poly hammer you can have/trade me for a regular one.

GOLDEN GUN · #58 05-12-2016, 7:04 PM

Il take it!

el tardo · #59 05-12-2016, 7:25 PM

Quote:

Originally Posted by GOLDEN GUN

my main concern right now is the aluminum bcg with steel hammer

why?

the hammer only rubs against(gets pushed down) it and only hits the firing pin.

the JP BCG works fine with any hammer

joefrank64k · #60 05-12-2016, 7:39 PM

GG, are you using the Ergo Swift?

GOLDEN GUN · #61 05-12-2016, 7:42 PM

Quote:

Originally Posted by el tardo

why?

the hammer only rubs against(gets pushed down) it and only hits the firing pin.

the JP BCG works fine with any hammer

Reviews say that the steel hammer on an aluminum carrier is too much abuse and will eventually lose its reliability.. Polymer hammer I'm assuming takes that concern away..

Quote:

Originally Posted by joefrank64k

GG, are you using the Ergo Swift?

I believe the ergo swift is heavier than the k grip no?

joefrank64k · #62 05-12-2016, 7:52 PM

Quote:

Originally Posted by GOLDEN GUN

...I believe the ergo swift is heavier than the k grip no?

Not sure, I haven't weighed mine. Just wondering which Ergo you were considering. I can weigh mine if you need the info.

ElvenSoul · #63 05-12-2016, 8:02 PM

I believe the Cav 15 lower is lighter 28 ounces lower, lpk, & stock

el tardo · #64 05-12-2016, 8:05 PM

Quote:

Originally Posted by GOLDEN GUN

Reviews say that the steel hammer on an aluminum carrier is too much abuse and will eventually lose its reliability.. Polymer hammer I'm assuming takes that concern away..

i read there site , thats just cover your azz info
JP says the aluminum BCG is only good for 10,000 rounds
just as with anything when you gain something you loose something.

i had over 1,000 rounds thru mine (JP) and it only took of the coating using a 3gsd trigger

GOLDEN GUN · #65 05-12-2016, 8:08 PM

Quote:

Originally Posted by joefrank64k

Not sure, I haven't weighed mine. Just wondering which Ergo you were considering. I can weigh mine if you need the info.

Not needed but if your curious yourself I'd love to know.

Quote:

Originally Posted by ElvenSoul

I believe the Cav 15 lower is lighter 28 ounces lower, lpk, & stock

Lower is 5.7
LpK is 5
Stock assembled is 9.3

Total is projected to be 20 ounce complete lower...

Quote:

Originally Posted by el tardo

i read there site , thats just cover your azz info
JP says the aluminum BCG is only good for 10,000 rounds
just as with anything when you gain something you loose something.

i had over 1,000 rounds thru mine (JP) and it only took of the coating using a 3gsd trigger

I'm probably going to end up using steel but I want a polymer hammer just in case

joefrank64k · #66 05-12-2016, 8:44 PM

Quote:

Originally Posted by GOLDEN GUN

Not needed but if your curious yourself I'd love to know.

Ergo Swift = 2.50 oz
Grip Screw/Washer = 0.14 oz

GOLDEN GUN · #67 05-12-2016, 8:53 PM

Too heavy for my blood

ziconceo · #68 05-13-2016, 11:09 AM

Why not cut the grip screw in half? It works fine for me

Sent from my 0PJA2 using Tapatalk

GOLDEN GUN · #69 05-13-2016, 11:31 AM

I have a 3/4" titanium grip screw on the way.. It's the shortest I can safely go and is titanium rather than steel

LeadFarmer74 · #70 05-13-2016, 11:35 AM

Quote:

Originally Posted by GOLDEN GUN

Too heavy for my blood

Hehe

FIREBALL_BRIAN · #71 05-13-2016, 12:50 PM

i like watching your builds. im like can we get this built yet!

GOLDEN GUN · #72 05-13-2016, 12:52 PM

Yea send me $$$ so I can finish it! Lol I'm out of $ and just got out of credit card debt and I don't want to go back

FIREBALL_BRIAN · #73 05-13-2016, 1:02 PM

Quote:

Originally Posted by GOLDEN GUN

Yea send me $$$ so I can finish it! Lol I'm out of $ and just got out of credit card debt and I don't want to go back

You're a smart man! and congrats on cutting that leach off! dump those cards.

I respect your decision. More planning in the meantime. I say aim for 3.5 pounds.

bokehshooter · #74 05-13-2016, 2:05 PM

Vertex Ops has a small sale for the rest of May. I bought a lot of my parts there for my LW build. Wish they had this sale when I was collecting parts. Just wanted to share.

My LW build is 4 lbs and 9 oz with a Holosun RDS. Can't imaging getting under 4 lbs as I tried to cut weight as much as I can. I can probably save a couple oz with a much more expensive BCG. Could save a couple with a 10" rail as I went with a 12". I could also hollow out my Taccom buffer. But overall, I think I am good with the weight for now. You can click on the link in my Sig to my Instagram to see a photo of my build!

Through the rest of May 2016 SAVE 5% on these lightest weight AR parts from VertexOps.com to build or upgrade your weight killing upper receiver.
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GOLDEN GUN · #75 05-13-2016, 2:12 PM

Sweet!

In other good news.. My upper got delivered today and even though the website advertises it as 5.85 ounces.. It weighed in at 5.5 ounces!!! So I saved .35 of an ounce without doing anything!!

bokehshooter · #76 05-13-2016, 2:18 PM

I believe the ergo swift is heavier than the k grip no?[/QUOTE]

Magpul K Grip is 2 oz flat
They have em at Lanbos Armory for $14.

bokehshooter · #77 05-13-2016, 2:20 PM

Quote:

Originally Posted by GOLDEN GUN

Sweet!

In other good news.. My upper got delivered today and even though the website advertises it as 5.85 ounces.. It weighed in at 5.5 ounces!!! So I saved .35 of an ounce without doing anything!!

Nice! I went with the V7 port door and straight rod for my 2A upper, looks sweet.

CandG · #78 05-13-2016, 2:23 PM

After this you should try for a heavyweight AR build... see if you can make one > 25lbs without adding superfluous rail accessories. Anybody make stainless steel receivers?