Skip to main content

PINNING AR-15 GAS BLOCKS

PINNING AR-15 GAS BLOCKS

The gas block on an AR type rifle must be carefully fitted to the barrel at the gas port and be securely attached so it won't move and cause short cycling. The front sight tower/gas block on rifles with iron sights is taper pinned in place and anyone who has tried to remove the pins can testify that it isn't likely to loosen.

Installing a long free float forend on your pet black rifle may require a low profile gas block hidden under those rails. Some blocks are split and clamp to the barrel and some come supplied with two set screws. There is a good chance that even when threadlocker is used on the screw threads either of these attachment methods can fail. Why not pin the block for extra insurance?

Pinning requires proper tooling so you don't muck up a nice barrel. Enter Black Rifle Disease Engineering and their gas block pinning fixture (Brownell's part # 100-006-129). This simple tool facilitates the pinning of Vltor set screw type gas blocks by anyone equipped with a drill press and a taper pin reamer.

The first and most critical step to pinning is to properly position the block on the barrel so the gas tap hole is directly over the barrel gas port. The hole in the block is slightly bigger than the port itself so slight misalignments won't be a problem. Most barrels purchased without a gas block installed will provide a dimple on the barrel opposite the gas port for the rear gas block set screw.  If your barrel lacks a dimple see my August 10th article on this site for dimpling instructions. Secure the block to the barrel and Loctite the set screws.


Install the BRDE drilling fixture over the block and secure the whole assembly in a vise. Chuck up a #31 bit in your drill press or mill and drill through the gas block and barrel using the hole in the fixture as a guide. Drill all the way through and remove the fixture from the barrel. Gradually ream the hole with a 2/0 taper pin reamer until the pin appears centered after it is tapped in place.


Detailed instructions for this procedure can be found at www.brdengineering.com

Gas block

Gas block secured to the barrel with set screws.

Gas block installed

Gas block installed in fixture.

Drilling

Drilling the pin hole with a #31 drill.

Ream the hole

Ream the hole with a 2/0 taper pin reamer.

Taper pin

Taper pin installed.

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

Recommended Articles

See More Recommendations

Popular Videos

SCCY CPX-4 in .380 ACP

SCCY CPX-4 in .380 ACP

New for 2019 is the SCCY CPX-4, a .380 ACP semi-automatic pistol that extends beyond the existing SCCY CPX-3 line of pistols.

Ruger Mini 30

Ruger Mini 30

Patrick Sweeney reviews Ruger's classic semi-auto chambered in 7.62x39, and why it's the perfect deer or pig gun! See Ruger for more details.

See More Popular Videos

Trending Articles

Governor Mike DeWine's STRONG Ohio anti-gun bill is facing strong, unified opposition.Opposition to 'STRONG Ohio' Remains Strong 2nd Amendment

Opposition to 'STRONG Ohio' Remains Strong

Buckeye Firearms Association - August 24, 2020

Governor Mike DeWine's STRONG Ohio anti-gun bill is facing strong, unified opposition.

We go behind closed doors at the factory to see how SIG Sauer's ammo is developed and manufactured!SIG Sauer Ammunition — How Good Is It? Ammo

SIG Sauer Ammunition — How Good Is It?

Tom Beckstrand - August 20, 2020

We go behind closed doors at the factory to see how SIG Sauer's ammo is developed and...

Unless Democrats rescind their proposed Gun Issuing Board, threats and anti-rights promises don't matterGun Control Speeches at DNC Misleading 2nd Amendment

Gun Control Speeches at DNC Misleading

JPFO - August 21, 2020

Unless Democrats rescind their proposed Gun Issuing Board, threats and anti-rights promises...

In the golden age of daily carry options, the Springfield Armory Hellcat OSP pistol is a helluva deal!Springfield Armory Hellcat OSP Review Handguns

Springfield Armory Hellcat OSP Review

Patrick Sweeney - August 12, 2020

In the golden age of daily carry options, the Springfield Armory Hellcat OSP pistol is a...

See More Trending Articles

More Rifles

Today, the Johnson rifles and machineguns remain a vivid example of what happens when the best products run afoul of corrupt powers-that-be; men who could not care less about the lives of mere enlisted men dying because their weapons failed them in combat.The Johnson Rifle and LMG Historical

The Johnson Rifle and LMG

Jim Dickson - January 11, 2021

Today, the Johnson rifles and machineguns remain a vivid example of what happens when the best...

Savage Arms introduces its first straight pull rifle: the Impulse.Savage Arms Impulse Straight Pull Rifle - First Look Rifles

Savage Arms Impulse Straight Pull Rifle - First Look

Firearms News Staff - January 05, 2021

Savage Arms introduces its first straight pull rifle: the Impulse.

Firearms News editor Vincent L. DeNiro took the Brownells Model BRN-601 AR-15 to the range for a test drive.Back In the ‘Nam Issue #21: Brownells Model BRN-601 AR-15 Video Review Rifles

Back In the ‘Nam Issue #21: Brownells Model BRN-601 AR-15 Video Review

Vincent L. DeNiro - November 16, 2020

Firearms News editor Vincent L. DeNiro took the Brownells Model BRN-601 AR-15 to the range for...

Savage Arms' straight-pull action IMPULSE rifle is extremely accurate, and comes with a plethora of features that will excite any big game hunter.Savage Arms IMPULSE Big Game Rifle Rifles

Savage Arms IMPULSE Big Game Rifle

Firearms News Staff - January 13, 2021

Savage Arms' straight-pull action IMPULSE rifle is extremely accurate, and comes with a...

See More Rifles

Magazine Cover

GET THE MAGAZINE Subscribe & Save

Digital Now Included!

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE Arrow

Buy Digital Single Issues

Don't miss an issue.
Buy single digital issue for your phone or tablet.

Buy Single Digital Issue on the Firearms News App

Other Magazines

Special Interest Magazines

See All Special Interest Magazines

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

Phone Icon

Get Digital Access.

All Firearms News subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets.

To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine.

Get Digital Access

Not a Subscriber?
Subscribe Now