Originally Posted by Jim K
Re: that BAR with a 5" group. Unless that gun has been shot out, it could be just badly fouled. I suggest checking the barrel and maybe using one of those electric cleaners (some gunsmiths have them or they can be made at home), then see if the gun shoots any better. I will say that 4" is considered within specs for most sporting rifles. (Most will shoot better, but if it does 4" the factory considers it OK.)
Really a electric (sonic?) gun cleaner?? Homemade?? Got a ref. where I can get a tech spec or drawing????