Quote Originally Posted by xero28
It will be fairly simple to drill a hole in a direct mount as opposed to drilling a hole and milling for an o-ring, seeing as how I don't have a mill.
Be forewarned that if you are using a CP direct mount on/off asa there is more to the mod than just drilling a hole in it. If you do that you will have just ruined a $50 asa.

Now if you choose to go with the direct mount asa that does not use the on/off feature then just drilling a hole may be all that is necessary.

I do not know for sure because in all the asa's I have modded, I always recommend the CP direct on/off asa. This is a personal preference but I like the ability to turn off and de-gas my guns when not in use.