Ejecting and Feeding Problems

[LRRPF52]

Hello All:

I am new to this forum and have run into an issue with my first 6.5 build. I am using a Mega Arms upper and lower with a Alexander Arms 20" barrel and bolt, Rock River bolt carrier, and Alexander Arms low profile gas block. My lower is also Mega Arms with a collapsible stock and a standard 5.56mm buffer and spring. I am also using an Alexander Arms 10 round magazine.

These are the first potential problems I see. RRA BCG's use AR15 carriers-too light. A Standard carbine buffer is usually 2.9 oz., again too light. Use an M16 carrier and H2 or heavier buffer with the Grendel.

The brass streaks on the bottom of the bolt carrier are normal, as are the slight scratches on the cases.

The Grendel gas and 5.56 gas are different systems, with the Grendel pushing long, heavier bullets with less chamber pressure, while the 5.56 pushes short, very light bullets with very high chamber pressure. The Grendel needs a heavier buffer and standard M16 carrier for starters, although it can be tuned with certain loads with an adjustable gas block.