Taco thinks chrome bore is to make for better shots. chrome bore diminishes accuracy. Easier to clean and maintain but harder to keep target accuracybut....but....Noveske has a fancy chrome lining process and they maching their bolts to 1/1000000000000 of an inch so only an idiot would use a colt or M&P.taco you still havent said what makes you such an expert on this over the folks that actually make these decisions.