Was thinking of upgrading my 7in carbine handguard to a 10 to 12 in quad guard. I will have to get a low-pro gas block, just wondering what rails you guys suggest, i would like a one piece, but they are pretty expensive. Can u have a 2 piece and not need a handguard retainer???? Any info or suggestions???? My rifle currently has a samson c-star on it, it is a Stag Model 2TL. Thanks....