this gun is awesome. this is the first bt-4 product i've used and i have no real complaints about it. i have been in several situations where my gun is shooting past my opponent and theirs are droping yards in front of me. it has a nice sturdy feels to it. the only down side is that because it is so long it makes it hard to move around tight corners. i have a Tac 8 pistol which i take out when i'm pinned down. i would recommend getting a pistol or something just in case. all in all as long as you clean your gun properly it will last and give good results.
Overall it is a great gun for people who like to keep their distance and who can handle the extra weight.