Mid-length gas ports are usually 9-1/2" from chamber, so a 10" or longer handguard would cover a lo-pro gas block. I don't have any personal experiences with Toolcraft bolts, but have heard good things about them, recently it seems that some people are wondering about their quality due to they've come down in price pretty significantly, but those are just assumptions I think at best by those people. Toolcraft in the past has been considered a very good BCG. I wouldn't hesitate to use one. Yes the Aero LT is a lot lighter then the Burris PEPR. The PEPR was long considered the best value for a one piece but was heavy. Then Aero came out with their LT and was close to the same price and a lot lighter.