Only my huntsman needed no tinkering. I have had 3 243 SL barrels (sent back to them and they send a new one with a clover leaf pattern picture shrunk down) and no matter what I try they will not shoot I cant get them to shoot any kind of group like they say its shooting unless I use very light bullets like 55 grs and thats not what I want it for. Spent hundred's$ in shells trying until just gave up. With a lot of tinkering got my 308 to shoot but personly I will not buy another. With all the time and money I spent I could have brought a much better gun and not have to tinker.