Got one of their 300BO pistol barrels, the threads were way off concentric so it wouldn't come close to passing the suppressor gauge. Don't remember if it was email or a contact form but I let them know, they asked for the barrel, sent me a new one and it worked fine. I don't think it took very long either. Now that pistol never saw any longer range shooting while I had it, just 15-25 yard steel so can't attest to accuracy but it for sure worked.