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rorschach
07-13-2006, 11:56 PM
I finally got around to fabricating an improved mag lock for my PTR-91. After much thought, I felt a spacer between the mag button head, and the receiver might work nicely. I dont know if anyone else has thought of something like this, but here goes.

The purpose is to lock a 10 round magazine in unlisted HK style weapons, thus complying with the requirements set forth in SB23. I made this lock to fit the JLD Enterprises PTR-91 rifle, which is a near exact homage to the Heckler and Koch HK-91 and G3 rifle. This may work for other non-listed HK's (SR-9, MSG-90) and other H-Klones as well (SW, Vector, Bobbies). Excuse my piss poor pics.

I started by measuring the diameter of the mag release button (10mm), the diameter of the release underneath the button (8mm, a 5/16" drill bit will work), and the distance between the receiver and the button (little less than 1/8", about .120).

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock002.jpg

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock007.jpg


I found a nice scrap of 1/8" steel that would fit between the mag button and the reciever, with some filing.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock025.jpg

After drilling a 5/16" hole, and grinding off some excess material, (lots of trial and error) heres what I ended up with:

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock030.jpg

rorschach
07-13-2006, 11:57 PM
After more filing and grinding, a test fit:

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock034.jpg

Heres a view from the rear of the magwell, lock is on the right. Please note the top of the lock has been tapered and rounded with a file to fit contour of the receiver. Pardon my thumb.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock036.jpg

Heres a the completed maglock, after much filing to fit. In order for the trigger housing to close over the lock, I had to remove about .020 or .030 of material around the edges, leaving it .120 just around the slot. Lots of filing and test fitting here.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock040.jpg

Heres the lock in position, note ten round magazine has been inserted.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock044.jpg

rorschach
07-13-2006, 11:58 PM
Locked in place and ready for trigger housing/pistol grip.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock043.jpg

Trigger housing closed, holding lock securely in place.

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock042.jpg

Completed rifle with locked 10 round magazine in place, pistol grip and flash supressor. HK collapsible stock on the way from http://www.RobertRTG.com and HK wide forearm coming from http://www.top-notchparts.com

http://i75.photobucket.com/albums/i309/tsol_roolz/HK%20maglock/HKmaglock052.jpg

I used a pair of vernier calipers, hacksaw, drill press with 5/16" bit, bench grinder, bench vise, a large file, and a pair of vise grips (to hold while grinding). I used a 2" scrap of 1/8" steel that I found under my dad's bandsaw. It took me about 2 hours to do, most of which was fitting, filing and re-fitting. No doubt someone with a Bridgeport mill, or even a Dremel could do this faster. Hell, even a 5/16" washer of the right thickness cut in half and ground to shape will prolly work. You can choose to finish it with matte black spraypaint, or leave it natural steel. Duracoat makes an HK finish that may look pretty good on this.

Although the magazine can be removed without tools, one must disassemble the rifle in order to do so. Once the pistol grip is removed, the lock, and magazine are easily removed. At this point, the magazine is detatchable, but there is no evil pistol grip or, if you are so inclined, collapsible stock, as they have just been removed. Be aware, that although one can swap magazines in this fashion, there must be no other evil features on the rifle, such as flash hider, foward pistol grip, etc. and you must replace the lock before reassembling the rifle, or you will be in violation.

Much thanks to Pat at Metro, and my dad who let me use his truck repair shop.

I would appreciate any comments and suggestions, either legal or technical.

AirborneStranger
07-14-2006, 12:22 AM
nice work, nice gun

JPglee1
07-14-2006, 12:41 AM
Good do it yourself... way to go!


J

xenophobe
07-14-2006, 12:46 AM
I made this lock to fit the JLD Enterprises PTR-91 rifle, which is a near exact homage to the Heckler and Koch HK-91 and G3 rifle.

The JLD Enterprises PTR-91 is the exact same receiver as the FMP G3S. JLD purchased all the machines FMP Portugal owned when they went out of business. Basically they are unlicensed copies made on real HK machinery.

adamsreeftank
07-14-2006, 12:52 AM
Great idea. Thanks for the how-to and the pics.

How easy is it to load through the ejection port?

rorschach
07-14-2006, 1:03 AM
Great idea. Thanks for the how-to and the pics.

How easy is it to load through the ejection port?


A pain in the *****. Hot and dirty, but quite doable if you wear a glove.


I am gonna experiment with a gripless configuration as soon as I get a stripped steel trigger housing to play with. I dont wanna ruin the nice Navy style plastic trigger housing that came with the rifle.

tpliquid1
07-14-2006, 9:24 AM
nice looking benelli

6172crew
07-14-2006, 9:46 AM
I think he is saying that if you remove the mag then first you have to remove pistol grip so its not a AW, but it still has the Flash hider. Id find a way to use a set screw to hold that mag lock in place. Good job! Nice review!

rorschach
07-14-2006, 9:51 AM
No it doesnt require a tool. It can be manipulated by hand, BUT the firearm must be disassembled to remove it (i.e. pulling your 2 stock pins, removing the stock/recoil spring assy, then the triggerhousing/pistol grip assy).

It doesnt matter if it requires a tool or not anyway, because when you remove the lock to swap out 10 round magazines, theres no pistolgrip or collapsible stock! That just leaves the flash hider which should be removed if you decide to swap mags this way.

grammaton76
07-14-2006, 11:56 AM
This is seriously cool. Any chance I could con you into setting it up as an article on thegunwiki.com? This post will end up sinking down to the bottom over time, but wiki articles stay put forever...

saki302
07-14-2006, 2:53 PM
Once the trigger pack is off, it is no longer a semiautomatic rifle- it's a receiver with some junk on it. I think as long as the trigger pack MUST be removed to pull the mag, you should be okay. An extra pin or set screw would be insurance though.

Great idea- big props for ingenuity!

-Dave

grammaton76
07-14-2006, 2:57 PM
Hmm, here's a thought. What if you were to put that mag-lock on a scanner, and then either trace the outline with a program or post it so one of us could? If you do it such that printing it on 8.5x11" paper would result in a 1:1 copy of it, that'd make a real convenient outline so that we can cut our own from sheet stock using a dremel or whatnot. I used that prototyping method when I designed my own latches for the server racks in my living room...

SemiAutoSam
07-14-2006, 3:00 PM
You have server racks in your living room ?

your not married are you.

My wife makes me keep our server racks in the spare room / my office.

well at least I get to keep my underroom how ever I like it.

grammaton76
07-14-2006, 3:32 PM
You have server racks in your living room ?

your not married are you.

*grin* You called it. Actually, unless she sprouts horns, I'll be marrying my current gf soon anyway, and she's cool with the racks. They're part of the home entertainment setup. I need to take an update picture though, as now my TV sits on a wheeled smoky-glass-fronted cart that used to be a teleconferencing cart at a dot com.

Originally these things didn't come with front door latches; I learned to do things with the roto-zip, drill press, and sheet metal in order to build my own.

http://www.cheapspeech.com/Pics/.House/Cleaning/200506//s_dsc00797.jpg

The one on the left, is all home entertainment center gear. The one on the right, is old Sun systems. And, yes, a lamp.

My wife makes me keep our server racks in the spare room / my office.

well at least I get to keep my underroom how ever I like it.

Ah, that sucks. Perhaps you should try making sure they've got fancy, pretty doors on them, and using them to store DVD players and such? :)

Blue
07-14-2006, 3:41 PM
I wonder if my CNC plasma cutter would be able to cut something like that out.

50 Freak
07-14-2006, 11:46 PM
I'll buy one....

jmgray
07-14-2006, 11:53 PM
There is a shop I take stuff to to have fab'ed up-They have samples of the pieces that can be made with different equipment. From what I have seen plasma might be able to do it, but it is so coarse (the arc sometimes hops around on sharp turns) from one run to the next you would get a lot of no-go parts. A laser would be better.

mailman
07-17-2006, 10:53 AM
good work!!

hiyabrad
07-18-2006, 9:16 AM
I would like to buy two of these for my PTR's. Can you quote me a price? Thanks!

DrjonesUSA
07-18-2006, 1:51 PM
Very good idea and nice pics.

Can you please post more pics of your PTR?

Good, clear and close-up images of that rifle are very hard to come by....

Is that the standard version or the "K"?

Did it come from the factory with those handguards?

rorschach
07-21-2006, 7:58 PM
Very good idea and nice pics.

Can you please post more pics of your PTR?

Good, clear and close-up images of that rifle are very hard to come by....

Is that the standard version or the "K"?

Did it come from the factory with those handguards?

Thank you!!:)

I will try and post a few more detailed pics soon.

Very hard indeed!

Standard. (edited 8/4: It's actually a K model, I found out when I tried mounting a standard G3 Wide Forearm, and it was too long!)

Yes.

Apeman88
07-22-2006, 6:00 AM
Really nice setup... I'm thinking of getting PTR91 myself. Looking at your design... would it work if the lock is somehow attached (mounted) to trigger assembly side so once you remove it, it automatically disengages the maglock and your free to press the mag release to change out the mag? I mean, since this seems to be "legal" becuase once the trigger assembly is removed from the rest of the gun... it can't be defined as an AW.

BTW... are you in So Cal? Did you order everything from out of state or did you get the PTR91 locally? If locally... WHERE and how much? Love to get my hands on one too. :D

Ken

SFV_Dealer
07-22-2006, 7:00 AM
Hey Brad,
I'm first for his mag locks!
I have 2 PTR91 KFM4 !
Hey Rorschach, can you start selling them ???

rodgster
07-22-2006, 2:08 PM
I'll take a couple of mag locks also. Please PM if anyone is selling them. Thanks,

rorschach
08-04-2006, 5:46 PM
If anyone is interested, I can fab one up for you. PM me for details.

SemiAutoSam
08-04-2006, 6:16 PM
How much green would you need to make a few per each that is ?

im thinking 5-10 or so ?

Could send you a chunk of stainless to make them out of.

hiyabrad
08-04-2006, 8:57 PM
I just got my two (Sorry Pat!), and they look great. I will try them out this weekend! Thanks!

SFV_Dealer
08-08-2006, 3:53 PM
Got 2 myself Brad! They are wonderful fit & finish. Got 1 left w/ a PTR rifle to sell!

Q
08-10-2006, 12:56 PM
that is sweet i need one! awsome post. are the aluminum 10rd original hk? i see the steel ones at jld. i think the steel one looks just like the psg1 but is 10rd instead of 5rd.

rorschach
08-10-2006, 10:04 PM
The JLD 10 round steel mags are great, but last I checked he was sold out. He was supposed to get more in the next week or so.

The mag in the original pic is a cut down 20 round aluminum mag, it came with the rifle. I have since replaced it with a full length 20 rounder, riveted to a 10 round limit. Heres a pic (its the one on top)

http://i75.photobucket.com/albums/i309/tsol_roolz/triad.jpg

http://i75.photobucket.com/albums/i309/tsol_roolz/HK001.jpg
Heres the PTR on the bottom, Genuine HK 911 on top. Both Rorschach lock and 10 rd mag equipped.
http://i75.photobucket.com/albums/i309/tsol_roolz/headbang.gif

Q
09-08-2006, 7:50 PM
got mine! thanks rorschach. it is a very clean lock with attention to detail. fit and finish superb. 10 round attached. it has a long way to go but at least i can take it to the range now. :D

update now i finally got a hk handguard and hk buttstock. still looking for a hk bipod and a hensoldt scope.

http://i108.photobucket.com/albums/n32/qbertquartz2/ptr91k.jpg

DrjonesUSA
10-17-2006, 11:30 PM
got mine! thanks rorschach. it is a very clean lock with attention to detail. fit and finish superb. 10 round attached. it has a long way to go but at least i can take it to the range now. :D
http://i108.photobucket.com/albums/n32/qbertquartz2/DSC05267-1.jpg


Oooooohhhhh.....is that the side-folding stock model???

Can you please post more pics????

Did it come from the factory with that handguard?

Thanks!!!

Scotto
12-11-2006, 2:10 PM
I have access to a water jet CNC machine.