07-19-2016, 03:39 AM
Mags were loaded with 10 RDS per for 3 weeks. No I have not removed the block and measured. I went increments with feeler gauges and did not get extraction/ejection until it was butted to the shoulder. The carbine buffers were standard weight. All 3 lowers functioned with 5.56 w/ carbine and middy and 300bo w/ carbine gas. This rifle was only a barrel and bolt swap. Upper and carrier have about 300 rounds through them. The carrier was dryer than I would normally run a virgin build but was oiled. I ordered more ammo and should be able to test in a few weeks again.