To be honest, I've never known any spring piston gun to NOT shoot loose after a time. There is a lot of two-way vibration with the spring piston guns. I have a Beeman, and I just make it a habit to tighten it up after about every 50 shots. Loc-tight doesn't help, in case you were thinking along those lines. And accuracy does fall off when they get loose. That's for sure. I've seen good Leupold scopes turned to junk in a day when mounted on these air guns. That's why they need a specific air gun scope built to take the two-way recoil from these guns.
Last edited by hunter01; 11/27/08.