Guys, there's only 2 words that someone bringing a product to market that is as complicated as a new block should use to the fullest. Those 2 words are: QUALITY CONTROL!!!! Every one of the problems discussed in all the posts about XR1 and XR2 could have been found and corrected with a viable QC program. It tickles me when some try to justify his problems by saying how complicated it is. Guys look around that's a piddling little machining problem.