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Gunsmithing Sets screws

BasraBoy

Gunny Sergeant
Full Member
Minuteman
Mar 29, 2008
2,348
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Dark Side of the Moon
Sorry if this a really stupid question......

I'm thinking about replacing my front sight/gas block on an AR with a low profile verion.

The existing assembly is a clamp on but I'd like to change to a set screw version.

Should the set screw detents on the barrel be threaded or are they just recessed for the head of the set screw?

Is there a standard size for these set screws?

Thanks in advance....
 
Re: Sets screws

If the screws are up from the bottom of the gas block assembly you can get away with doing nothing to the barrel, if you have access to a milling machine a small flat is a nice touch.
From the side of the block, will require flats be milled for the set screws, to insure a no wind zero can be set.
 
Re: Sets screws

Thanks kreiert

All the screws would be from the bottom.

But as far as I can find out the Douglas barrel has the dimples/detents in it for the gas block and Ops Inc collar as standard? Does anybody know if this is this correct?

 
Re: Sets screws

It depends on who machined the barrel. Usually on the bottom 180 degrees from the gas port there is a dimple. This is used to help you get the gas port aligned with the block.