The doors on the aide distinguish an MILSPEC van from other containers.

Yes. I can fit my Magpul MOE and CTR stock.

You can't. They were never released for public sale, and never will be. The M1A is similar in some aspects, but hardly milspec, with its metal injection molding parts in the internal components.

The extension tube of the commercial buttstock is actually thicker than the milspec extension tube, and they tend to be slightly angled at the end.

Personal ownership of any firearm is governed by the laws of that state or country- and we get inquiries from several countries. In the US, a private citizen CAN own a milspec rifle- however, since the M16 series of rifles is capable of full auto fire, they are classed as machineguns. Only those machineguns already registered with the BATFE by May 1986 can be transferred to a private citizen. The M4 carbine was created after that date, so an individual cannot legally possess one.