I had to buy one! And man, what a beast!!! Mine is a .177 with a Gamo 3x9 scope. So far the scope is working fine. Maybe about 500rds. thru the pipe. I can only handle about 100rds. a day before I'm worn out, I'm not as young as I use to be. It shoots the best with the fore end on sand bags but no bag in the rear! So far shooting 3/4 inch groups @30rds. with Crossman Premiere 10.5's