Hi new here and new to 9mm AR carbines. I just received an upper and lower from Palmetto State Armory. The lower is complete and uses glock mags. The upper has a 16" barrel with hybrid BCG. http://palmettostatearmory.com/psa-16-9mm-nitride-1-10-13-5-m-lok-railed-upper-with-hybrid-bcg-ch-516446602.html .
I shot the rifle today with my reloads I use in my CZ SP-01 Shadow. The overall length on the rounds is around 1.125". They are 115gr xtreme plated round nose. I shot about 100 rounds of these and had 2 rounds that didn't quite make it into the chamber. Do I need to go shorter or longer on the OAL to correct this? Thanks, Mark.