Ok so I see alot of info on LPK's, but the other pieces parts get left off of build plans. Is a mil-spec m4 stock tube, a mil-spec m4 stock tube, a mil-spec m4 stock tube, or are there differences. Also other than the discription of H-buffer and the springs, are the internals of the stock anything to put thought behind. I am looking at getting the palmetto state armory lbk, but want to be sure that the tube is a excellent one before I pay a gunsmith to put it on and stake it for me(first build so I am going to have a gunsmith give the whole rifle a once over). Are there any other companies that offer a package deal like Palmetto state armory that you guys use?