AR15 not lock open properly

Update works 100% with the reloads at 3050 fps using standard buffer and Wolf extra power return spring. Haven't tried hotter Ammo yet but it works 100%. Fired about 250-300rds
 
At range again today after about 200rds fired I tried factory American Eagle and worked fine also using standard buffer with Wolf extra power carbine spring. Then I put in H2 buffer and it failed to lock back once in about 15 mags using the 3050 fps reloads but with factory ammo it worked 100 %. So i guess I could use the standard buffer till i use up the reloads and the H2 buffer for factory.
 
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