A & C seem to be the least desireable options
A) open up the port too much and your over gas could be very detrimental to the workings of the whole bolt carrier & piston group as once drilled out...
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A & C seem to be the least desireable options
A) open up the port too much and your over gas could be very detrimental to the workings of the whole bolt carrier & piston group as once drilled out...