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Failure to feed problems - PMAGs, 300/221
I've been shooting my 300/221 AR pistol quite a bit lately and have been having a lot of failures to feed, even with PMAGs, actually especially with PMAGs. I'm pretty sure I know what it is. I think its because the goofy bullets I'm shooting have a super long ogive and they aren't contacting the mag to pop them up on the way out so the tips are staying low and hitting below the barrel extension feed ramps. I've also had a couple with 125gr TNT bullets.
Would the proper thing to fix this be to cut M4 style feed ramps into the upper/extension?
I haven't tried enough different mags to know if it only happens with PMAGs, its just that I have used them 95% of the time and haven't had it happen the other 5% of the time. I've been using the 20rnd PMAGs, I have 4 20s. It typically happens to the first couple off the top of the mag, I'd say within the first 5.
The gun is cycling just fine, enough power for the buffer to slam against the back of the tube(not too much though).
I don't know the proper way to cut M4 feed ramps but I'm pretty good with rotary tools and machining equipment.
Any pointers/help would be appreciated.
Jon
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