Well if lapco ever gets around to making the fsr barrels I'd say that. Several of us have requested it but as of yet it hasn't been completed. Beyond that I'd say just a. 683-.685 14 Inch smooth bore. Or you could give the hammerhead a chance. According to trinity they work wel with first sstrikes. Personally I have my doubts but I haven't tried it yet so I can't argue. They have a. 684 rifled I believe but you'll have to get a. 683 or a. 685 barrel back. That's one of thing that bothers me about them is that the back sizer doesn't match the bore of the barrel.