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The military does not use Ar15 to M16 conversion kits. The military has M16/M4 lower receivers that hold real M16/M4 trigger groups. These trigger groups will not fit in a civilian AR15 the receivers are designed to be incompatible as are the civilian bolt carrier groups.

You can modify a civilian AR15 lower receiver by drilling the dreaded “third hole” the drilling of such a hole is a 25 year federal felony and there’s not tax stamp for it as any modern drilling would be a post 1986 and a felony. Even with the third hole you need a full auto conpatable M16 bolt carrier which are not regulated but most manufacturers use civilian bolt carriers that have a cut out where the sear would interface.

I did 2 years my last 2 as a CID agent and was our units armory back up I have stripped uncountable numbers of M4s down to components it’s not easy at all to turn a AR15 into a real M16 you need a drill jig at the very least and the ATF will throw you under the jail just for drilling the hole, it’s an additional charge to posses the trigger groups and yet another charge to have the sear given that both the trigger groups and the sear are EACH considered a machine gun you get two 25 year charges plus the constructive intent charge an additional 25 years. Is 75 years of federal time worth it...

"The military does not use Ar15 to M16 conversion kits. The military has M16/M4 lower receivers that hold real M16/M4 trigger groups. These trigger groups will not fit in a civilian AR15 the receivers are designed to be incompatible as are the civilian bolt carrier groups."

Having been signed for three arms rooms, I'm quite aware of that. I was using the term, "conversion kit" not as a property book item or an NSN item, but merely in terms of potential parts that could be pilfered from a unit arms room by -20 (organizational) or -30 (DS) level maintainers and introduced to a black market where the mods could readily be made.

Yes, the penalties for modifications, possession, etc are very severe. That's precisely why I posited that as a possible alternative theory to SPC Guillen stumbling across a drug operation. If she found herself unwittingly involved in, or threatened to expose the diversion of components, the steep penalties would be a possible motive for her murder.