Testing new setup. Radial delayed blowback 5” barrel/bcg combo from CMMG utilizing New Frontier Armory billet c-4 upper and Meanarms endomag inserts. It does not like Speer lawman 147gr (flat nose). Used all 115gr 9mm. Omega 9k silencer, colt sp1 m-16 lower. MVB Arc Ti stock w/h2 buffer, Geiselle SSF trigger, Odinworks handguard, fortis foregrip.
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How was the recoil impulse compared to straight blow back 9mm uppers?