This might sound like something of a stupid question but here goes anyway. I have a FNH PBR, 18", .308 with the Winchester push feed style action. I read somewhere that the machining on the receiver for post-64 actions were pretty much the same for both the push feed and the controlled round feed actions. My question is basically, seeing I'm thinking about re-barreling, if I found a control round feed bolt and got the extractor cut on the barrel, would it all come together? Also, and just as important, would I notice a damn bit of difference for my investment? Sorry if this question is stupid, just exploring possibilities for other improvements when I replace the barrel.