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