THIS is the reason these forums are handy...because some type what they run and it doesn't work. I've been doing research, in order to not screw up my first 308 build...this kinda thing gets confusing. In fact, I'm going to threadjack, because you guys seem to know what you're talking about.
Problem: A sales guy is trying to inform me that a standard Carbine MIL-SPEC buffer tube will not work with a 308 Carbine Spring/308 Carbine buffer setup. Black Rain "told him" that only commercial tubes will run properly. What? I have a DPMS type lower/upper (in case it matters). He claims the tube is not long enough, even though the 308 Carbine buffer is shorter. He's holding up my order over this...what say you?