What is the I.D. Of the gas tube hole in a FSB ?

[SideShow Bob]

What is the I.D. Of the gas tube hole in a A2 F marked FSB ?

[SouthPaw]

I have no idea what it is but I'm curious to know why you are asking?

EDIT: I misread your first statement. I thought you were asking the ID of the gas tube itself.

[ray1970]

If you just want a ball park number, the gas tube is about .180" so the hole it fits in is probably a couple of thousandths over that.

[Great-Kazoo]

Depends on mfg.

[SAnd]

64658
This is from a drawing that is supposed to be the O-ficial mil-spec drawing. I can't read the drawing number or other writing in the corner.

The complete drawing is a 852KB pdf. I will e-mail it to you if you want. Or PM it. I don't know if I can send a pdf through a PM though.

[SAnd]

An alternate from the same above drawing-
64659

[SideShow Bob]

I need to thread the hole & use a screw to hold the front hand guard plate in place for a faux dissipator.

So now, what machine screw size is .180" ?

[SAnd]

#12 x 24 threads per inch uses a tap drill size of .177 or #16 drill bit for 66% thread.

#12 x 28 threads per inch uses a tap drill size of .180 or #15 drill bit for 70% thread.