ok, added some more items to my list of what i am looking at buying. please let me know of any issues you can see. parts list: MATEN Ambi NiB receiver set Rainer Arms Select 20" SS barrel (will get salt bath nitride treated) JP Ent complete Low Mass BCG w/ enhanced bolt JP Ent 12" Rapid Config handguard Magpul UBR buttstock Magpul MIAD grip Geissele SSA trigger set Slash Car10 buffer and spring As far as I can tell, I still need: gas system (block and tube), safety selector, mag release, muzzle device, sights. Am i missing anything from either list? What do you all recommend for the parts I still need? for a muzzle device and gas block, i want something I can still use a bayonet with if I can.