I purchased an AR-15 from the Sillman Cartridge Company at a gun show in Fayetteville NC this past weekend. I had several people tell me at the show that the rifles they had were from this really substandard company MMC which is a machine shop that was apparantly at one point making lowers for this company that the BATF shut down named Roggio Arsenal. Roggio was shut down because there stuff was so far out of spec it was dangerous. This unit that I bought from Sillman Cartridge Company is in that same boat. The funny thing is these guys bad mouthed Del-Ton and their products vigorously. So I bought a del-ton rifle from a local shop and its a shooter and the moores is a hunk of junk. The castle nut was put on wrong, it is backwards. It was hand tight only. The trigger and hammer pins wiggle out just from shaking the rifle. They blew sunshine up my but about how the MMC stuff was being used by the military. That is a lie. Warning you should beware of the Sillman Cartridge Company and MMC or Moores Machine and Tool AR-15 Rifles. They are one and the same with Roggio Arsenal, and Timber wolf. Companies that keep disappearing and reappearing under new names with the same junky ***. A quick look around google will show other complaint boards with gripes about their ammo as well. I have had it with these no name manufacturers at these shows Although this is the only bad AR I have ever owned as I started looking online I found complaints about Roggio Arsenal, Elite Arms, Moores Machine and Tool, MMC, Timber Wolf, and so on. Stick with a brand you know and recognize DTI, Del-Ton, Bushmaster, Rock River, DPMS, Colt LMT. There is a reason there stuff is so much cheaper than the reputable guys, it is Garbage.