07-26-2011, 12:05 AM
Ok, so I am the new guy, but yes, I did use the search function! Anyways, I have a Grendel upper I put together myself using an AA 18" barrel and bolt combo, MI lo pro gas block, AA receiver, and LMT carrier. I am running it on my existing M4 lower with collapsible stock, standard carbine length spring, and Spike's ST-T2 buffer. The problem I am having is the majority of my spent brass barely makes it out of the rifle and lands right next to me on the bench. A few will actually eject and make it about 5ft in the 2:00 position. There are 2 heavy gouges in the rims of the casings from the edges of the extractor claw, but when I place a case in the bolt face manually and let go it drops freely from the bolt so I don't think it is hanging up. I am having no issues with short stroking and the bolt always locks back on a dry mag. Any thoughts?