AR-15 Gas block screws


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119er
August 14, 2014, 01:32 AM
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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rcmodel
August 14, 2014, 01:53 AM
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

ApacheCoTodd
August 14, 2014, 04:11 PM
Try 8-36 or M-4.

BBBBill
August 14, 2014, 04:26 PM
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?q=Fastenal+Houston+TX&filters=segment%3a%22local%22&chain=59162&src=IE10TR&pc=MATBJS&qpvt=Fastenal+Houston+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=fastener++houston+tx&qs=n&form=QBRE&pq=fastener+houston+tx&sc=1-19&sp=-1&sk=&cvid=4cb10437f60d4e098153af7fce4ce01e

Reloadron
August 14, 2014, 10:31 PM
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 (http://www.mcmaster.com/#set-screws/=ta7iz0) 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

119er
August 15, 2014, 02:55 AM
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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