I have one of these for Beta testing I will let youy all know how it goes. Off the top, it is well made holds 10 rounds and fits on any standard AR-15 lower. The handguard is free floated and it is small in diameter. It is a great little package. So far it has been very reliable but I have only tried WW 40 grain H.P.s The mags are made from aluminum and are very robust. The release date is October depending on Beta testing. KurtM