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Old August 14, 2014, 12:32 AM   #1
119er
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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.
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Old August 14, 2014, 12:53 AM   #2
rcmodel
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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.

rc
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Old August 14, 2014, 03:11 PM   #3
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Try 8-36 or M-4.
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Old August 14, 2014, 03:26 PM   #4
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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
Reloadron
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Quote:
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.

Ron

Last edited by Reloadron; August 14, 2014 at 09:40 PM.
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Old August 15, 2014, 01:55 AM   #6
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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!
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