My MP 5.7 only like PSA ACC ammo

[reckless1911]

Finally got my new 5.7 to the range the past two weeks and for some reason shooting Fiochi or American Eage, the gun fails to eject every sing round.... Shooting the ACC stuff, it cycles totally fine. Had the same issue with my PSA 5.7 the first trip to the range last week where they both did the exact same thing, but this weeks trip it resolved with the PSA which was fine shooting all 3 ammos but the MP continued with only shooting the ACC. Only obvious difference is the coating on the shell. The fiochi was 62 grain and the ACC and American eagle are 40 with the ACC being red tips.

 

[silverstring]

Weird. I did my first range test using Fiochi 40grn FMJ and it fed/ejected all fine.