Doesn't work with 50 cal - TRYBE Defense AR-15 Fully Assembled Upper Receiver Type II w/ Dust Cover & Forward Assist

Of course loads, but doesn't eject 50 call Beowulf. Side port to small so beware. But put on the 7 62 ya baby. Fun good times get pewpewing. And the shipping was fast. The mag looks awesome like the capacity. It's light weight strong but tink tink feel. Worth it