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Old 07-07-2009, 3:38 PM
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fredieusa fredieusa is offline
Join Date: Mar 2008
Location: Contra Costa County
Posts: 433
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Gas Port Hole Drilling

The gas Port is pinned and is set in place. Drilling the gas port hole will complete your rifle's transformation to a semi-automatic.
Given this fact, you may want to leave this step to the very end given your legal circumstance.

Your Gas Block already has a hole drilled though it. You can gauge the hole size by inserting different drills in.
I use drill size # 27 (~3.61mm). I guess you can also get-by using a #28 (~3.53mm)

Simply use a hand-held drill and drill away. Use lube/cutting oil. Be careful not to over drill as you don't want to disturb the rifling on the "other/opposite" side.

Once you are through drilling, clean thoroughly using a brass bristle brush. Check for obstructions.
Use a reamer if you have one, I always do.

Last edited by fredieusa; 07-08-2009 at 12:01 AM..
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