the trick is to figure out exactly what you want and what you will use it for... before i called accurate ordnance, i sat down and figured out exactly what i wanted and what i want to do with my rifle... when it came time i called Mark, told him im going to run a xlr chassis with AI mags... i had a bartlein barrel and apa lil jimmy for a remington 700 that needs to be trued... i also told Mark that I will be shooting either 168 or 175 grain SMK or Berger.... the reason they needed to know how to cut the chamber.... thats where the "match" chamber from.... its just tailored for a specific set up... i literally just went through just about any questions you might have... feel free to PM me