Where I live I can only get a 300 BLK with a 16in barrel so found aero precision upper for 375, also I cannot put a can on it, so my question is will it cycle subs with a pistol length gas system on it, from what I'm hearing locally it can not, if that's the case then I don't see much reason to get it, seems like the things that make it a popular round are things I can not have where I live, will be looking forward to your input.