AR-15 Gas block screws - THR

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Old August 14, 2014, 12:32 AM   #1
Join Date: May 3, 2011
Location: Houston
Posts: 536
AR-15 Gas block screws

Have a BCM low-pro gas block and had to drill a set screw out. Appears to be 8-40 but not sure. Anyone know? Or know where I can buy the set screws? Hardware stores seem to be all 8-32.
Nec Aspera Terrent
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Old August 14, 2014, 12:53 AM   #2
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Join Date: September 17, 2007
Location: Eastern KS
Posts: 49,374
I don't know what thread they are.

But Houston is a very big city.
There should be almost no end of industrial supply companies there that stock every size Allen-Head screw ever made.

Check the yellow pages, and take the gas block with you to try it on for size.

Don't put all your eggs in one basket.
Or all your primers in a glass jar!
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Old August 14, 2014, 03:11 PM   #3
Join Date: June 30, 2011
Location: Arizona
Posts: 2,885
Try 8-36 or M-4.
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Old August 14, 2014, 03:26 PM   #4
Join Date: March 7, 2005
Location: Florida
Posts: 1,364
First, call Paul at BCM and ask what it is: 1-877-BRAVO CO 1-877-272-8626. Heck, they might send you one.

Fastenal is usually a good source - http://www.bing.com/entities/search?...TX&FORM=SEMORE

Here are a few others that might have what you're looking for, though some of them might be more oriented to large industrial - http://www.bing.com/search?q=fastene...53af7fce4ce01e
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Old August 14, 2014, 09:31 PM   #5
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Join Date: July 6, 2012
Location: Cleveland, Ohio USA
Posts: 3,256
BCM Low Profile Gas Block for AR15, M16, M4, M4A1. Machined of steel, phosphate finish, for .750 barrels.
Manufactured within very tight Mil-Spec tolerances on all ID's.
Barrel ID honed after finish per USGI TDP.
Made by Bravo Company MFG, Inc. with set screw mounting.
Set Screws are Steel 10-32 x 3/16 Knurled Cup Point
You want 10-32 screws 3/16 Long. You should be able to find them just about anywhere. That gas block is a set screw design. McMaster Carr has them at about $11 per hundred (life supply with a few left over) Just make sure you get the Knurled Point Cup design.


Last edited by Reloadron; August 14, 2014 at 09:40 PM.
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Old August 15, 2014, 01:55 AM   #6
Join Date: May 3, 2011
Location: Houston
Posts: 536
Thanks everyone. I went to Home Depot and picked up a 10-32 drill/tap on my way home. Job is done. I used a stainless cup tip setscrew along with the knurled cup tip originally included with the gas block. Some blue loctite and here we go.

In the business I work in we will sometimes use cup tip set screws to act as a strongback to prevent axial separation of defective pipe/equipment welds. Typically on systems that have low thrust loads. The cup tips are used to "bite" into the pipe to prevent movement.

Anyway, I think it'll do!
Nec Aspera Terrent
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