sgms18,
You may want to touch up the barrel extention a little, with a dremel or a small diamond file set. I took a little off the center lower lug so it had more of a ramp shape. I also put a slight angle on the outsides of the actual feed ramps, that kind of guides them in rather than hanging up. Finally I added feed ramp extentions into the upper, like an m-4 feed ramp, my upper did not have them. With that little touch up I use 20 and 30 round GI mags and have not had any issues with the 240gr OUTLAW failing to feed.
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"Get down, shut up" Lieutenant DAN
Crush these communist's posing as americans with liberty, and let them taste their own blood, that pumps for the hammer and sickle.
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