I am looking looking to build a 300 Blackout Pistol. I want to keep the costs low but not so low that I can't get my money back out of it if I decide to part with it. I have a PSA lower in the mail. I am thinking: CMMG LPK Magpul grip and AFG ~8" stainless Barrel YHM - free float carbine length quad rail ~7" Vltor set screw gas block - May drill and tapper pin Some form of compensator to direct blast forward The big question I have right now is wether or not it is worth the additional cost for a left side charging handle upper or not. I could argue it either way. What would you do? What would you change?