Ok, so Im new and starting on getting things together. Looking to build a marksmanship 308. Ive picked up a LMT MWS stripped lower (non-H) and a Centurion Arms billet upper receiver. LMT light lower parts kit. Trying to figure out what to route for a stock. not sure if I should order LMT carbine buffer tube or go w a rifle length. When I get my BCG i plan on ordering a barrel from Bartlein want a 20" threaded so i can attach a can when desired. Also looking at getting a LMT BCG was wondering if there is a difference in their BCG between the FA and SA version