allen screw

**mytyace** · 10-07-16, 15:39

does anyone know what size allen is need for the pistol grip on psa lower

**IraqVet1982** · 10-07-16, 15:48

1/4x28 thread pitch

**mytyace** · 10-07-16, 15:59

I need to know what size allen wrench is needed to remove it. sorry I should have been more clear

**ColtSeavers** · 10-07-16, 16:09

Quick google search turns up 3/16". I can confirm/correct when I get home from work. Don't have it memorized as I just grab the one that i always do from my clamshell multi size carrier.

**mytyace** · 10-07-16, 16:12

thank you I wasn't sure all ars were the same

**tb-av** · 10-07-16, 16:14

If it's 1/2x28 it's probably going to be 1/4"

But those screws are/can be, different based on the -grip- , not based on the lower.

Plus it's usually a cap screw which would be a bigger wrench like probably 3/8"

Don't you have a set of wrenches?

I have a round head hex screw here that's 5/32" and 4mm also fits it. I think it's s TD grip.

Just to be clear... the "Button" head type as seen top left of the 6 styles.
https://www.grainger.com/category/so...ecatalog/N-8n7

Also I think that screw is 1/4x28 not 1/2x28.

The drive for a 1/4x28 socket head cap screw is 3/16" per Grainger site. But, the Button head is 5/32"

So does yours look like
This - 5/32" drive
https://www.grainger.com/product/GRA...Code=P2IDP2PCP

or This - 3/16" drive
https://www.grainger.com/product/GRA...Code=P2IDP2PCP

**lysander** · 10-07-16, 17:22

Originally Posted by mytyace

does anyone know what size allen is need for the pistol grip on psa lower

Technically, it is called an Allen key, hex key, or Allen wrench.

The first post was correct in referring to the screw size (see your title).

**Averageman** · 10-07-16, 18:52

If you are going to use these often save yourself a lifetime of heartache and buy a set like this.
http://www.sears.com/jdm-auto-lights...&blockType=G14
You can use them in some tight places and even with a torque wrench.