5.7 AR Upper that accepts P90 magazines...

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Yeah Ive seen those. The downside is that it seems like kind of a waste, since the 5.7 round was developed to give equivalent penetration to .223 in a gun smaller than an M4, so its kind of a step backwards to start shooting 5.7 out of AR-15s. But I guess there has to be an upper in ever caliber.
 
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CharlesAFerg
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Yeah Ive seen those. The downside is that it seems like kind of a waste, since the 5.7 round was developed to give equivalent penetration to .223 in a gun smaller than an M4, so its kind of a step backwards to start shooting 5.7 out of AR-15s. But I guess there has to be an upper in ever caliber.
50 round magazines. Full auto ARs would benefit.
 
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CharlesAFerg
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Yeah but you could get a PS90, admittedly it wouldn't be full auto, but 5.7 ammo costs far more than .223
Oh heck yes, good luck finding the good stuff.
I do not like the feel of the P90 at all, but I absolutely love the AUG.

This is one of those rare cases in which I would prefer a regular .223 AR.
Besides, this mod is just for fun.
 

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