At-15 cycle issue
Posted: Thu Aug 05, 2021 6:52 pm
Hey guys newbie here to the forum. I just recently built a 450 bm and I’m having issues with it cycling properly. It’s a Davidson’s Defense upper with a SAA BCG. I use PSA lower for this build with PSA lower build kit. I started out with an H1 buffer at 3.4oz and it would eject brass but not strip amd load next round. So I installed an H3 at 5.4 oz and same issue. I don’t have an adjustable gas block and I’m using two different magazines but from same company. They are steel 450 BM magazines. I’m using Double Tap amd Hornady ammo for testing and break in. So far I have about 30 rounds thru it. The Douple Tap ammo actually did lock back the action a couple times as I was only loading one round at a time. I just wanted to see action was working but only 2-3 times it actually locked open. Today I tried some reloads and the same issue persists. What should I be checking next?