I don't shoot a 64LP, but my UASFS pistol is a center grip conversion of an Exemplar 14". Super Club is my ammunition of choice, and it is accurate enough to hit Fifth Scale chickens at 100 yards if I do my part. FYI, a good friend of mine has done tons of testing of various Anschutz pistols, and he has told me on numerous occasions that their barrels are every bit as good as any aftermarket barrel.
Steve W.