Works great for me - Grid Defense 5.56 Upper Receiver

I paired the 10.5" barreled upper receiver from Grid Defense with a BCG and charging handle from Anderson Mfg and a carbine-buffered lower with pistol brace from PSA. I have had it to the range one time so far. I ran about 50 rounds of PMC 223 through it without any issues. It seems much quieter than I had expected, but not sure what the guy on my right side thought about it. I like the nitrided barrel. I also like the free-float m-lok hand guard. The hand guard has holes cut on both sides to accept a QD sling swivel which is nice. And I also like that the picatinny rail does not extend down the full length of the hand guard, leaving room in the center for your hand if you want to use a C-clamp style grip. This is my second AR upper receiver from Grid Defense. The other one is pretty much the same setup only it has a 16" barrel and longer hand guard. The fit and finish on both are excellent. If you're looking for a nice budget option, I highly recommend Grid Defense uppers.