I agree with 500WE and Ernie, if you are looking for recoil reduction max, it will be tough to beat the arrestor break. The porting was already done on my 309 when I bought it. I doubt I would have ordered it that way. I ordered my 375 with no porting of any kind but with the heavies, its sort of nasty in the torque department. It will most likely go to MI for some ports down the road. My 375-06 JDJ had the arrestor brake and it worked amazingly well. I will say though, my 309 is just a baby doll to shoot. On those long shots in W KS, its nice and the noise isn't an issue.