How to Install a Collapsible Stock on an Armalite AR-10

How to Install a Collapsible Stock on an Armalite AR-10

Years ago, I bought an Armalite AR-10 rifle. Admittedly, I'm not a huge fan of the Armalite or DPMS .308 AR platforms. The early magazines didn't feed well, and the rifles seem big and awkward to me.


In any scenario where I really needed a .308 semi-auto rifle, I would feel more comfortable with an M14. But I bought one with a 24-inch heavy barrel and it shot reasonably well — although I wasn't happy with it in its original form. As the years passed, I gradually modified the big AR to better suit my needs.


Recently, I decided the as-issued A2 buttstock had to go. I wanted a collapsible stock so I could adjust length of pull and increase comfort. You can't simply install an AR-15 collapsible stock kit on an AR-10, due to the length and mass of the .308 bolt carrier. The specific parts needed are detailed below.

Receiver Extension: Also known as the buffer tube, the receiver extension contains the action spring and buffer. When the rifle is fired, the rear end of the bolt carrier travels into this tube a certain distance before it moves forward again into battery, and the length of the AR-10 bolt carrier assembly requires more travel than a standard 5.56 mm carrier.


Armalite employs a standard AR-15 receiver extension on its AR-10 rifles but gains extra travel with a shorter buffer. The AR-10 rifle buffer is the same weight as an AR-15 rifle buffer but is ¾ inches shorter.

To maintain this extra travel with a collapsible stock, we will employ a slightly longer carbine receiver extension. Vltor Weapon Systems markets a special tube for their A5 stock kit (part no. RE-10) that works on the AR-10 perfectly. It is about ¾ inches longer than a standard M4 carbine extension.

Buffer: The AR-10 carbine buffer is actually an extra heavy H3 AR-15 carbine buffer that employs three internal tungsten weights to achieve the same weight as the rifle buffer in a shorter package.

Action Spring: Armalite AR-10 carbines utilize the same action spring as the rifles, so in my case I already had the spring I needed.

For a buttstock I chose the excellent Vltor Enhanced Modstock, but any AR-15 carbine stock will work with this setup. Keep in mind with the longer buffer tube, the carbine stock will not collapse fully but it will adjust shorter than a fixed stock.

As my AR-10 evolves, I'm starting to like it more and more. In future articles, I'll cover trigger and handguard mods for the AR-10.

Recommended for You

2nd Amendment

Firearms News Investigates the NRA: Part 1

Nedd Scott - July 18, 2019

This will be the first of many investigative reports about the NRA by Firearms News.

Rifles

Suppressor-Ready CZ 527 Review

David M. Fortier - July 22, 2019

CZ-USA's handy CZ 527 7.62x39mm bolt gun now accepts a sound suppressor.

2nd Amendment

Ontario, Canada Chief Firearms Officer Comments on AR-15 Buying Surge and Gun Licensing

TheGunBlog.ca - July 16, 2019

Ontario Chief Firearms Officer, Dwight Peer, spoke with TheGunBlog.ca about the Canada-wide...

See More Recommendations

Popular Videos

Performance Center M&P Shield M2.0

From Smith & Wesson, the M&P Shield M2.0 is a great option for a carry gun with optics option.

The GPO Rangeguide 10x50

If you need to see your game, and know the distance in all hunting environments, the GPO RANGEGUIDE 10×50 is your winning ticket.

American Suppressor Association (ASA)

ASA is the unified voice of the suppressor industry and a leading subject matter experts on suppressors and suppressor related advocacy.

See more Popular Videos

Trending Stories

Air Guns

AirForce Airguns Condor Ring-Loc Kit Review

Tom Gaylord - May 29, 2019

Sponsored By
Airforce Airguns
2nd Amendment

SPECIAL REPORT: BIG 2A HISTORY BEING MADE IN LITTLE RHODE ISLAND

John Peterson - May 22, 2019

Rhode Islanders are setting brushfires for freedom once again as they advance a Second...

2nd Amendment

Tell the White House that the 2nd Amendment Was Not Given to the People by Government

Firearms News - July 02, 2019

Please sign and share the petition to get the required 100,000 signatures by July 27.

See More Stories

More Gunsmithing

Gunsmithing

Building a Heavy AR-15 Varmint Upper Part 3: Final Assembly & Test Fire

Gus Norcross - January 27, 2014

In Part 2 we left off with our gas system installed, ready to screw on the fore-end tube. Most...

Gunsmithing

Brownells AR-15/M16/AR308 PRS Buttstock Kit

SGN Online Editors - September 15, 2014

This fully adjustable stock and comb for AR-15/M16/AR-Style .308 rifles readily adapts length...

Gunsmithing

Cerakote - The Hottest Finish in Firearms

James Tarr - February 14, 2019

Cerakoting of firearms has become hugely popular, more so for decoration than protection,...

See More Gunsmithing

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction.

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE

GET THE NEWSLETTER Join the List and Never Miss a Thing.

×