Re: Question
You can sell it just fine. It's not like it's any type of weapon that would be subject to BATFE regulations. Like was said above, it's just some metal work.
If you're REALLY concerned, you could write up a bill of sale that lists the item as "scrap metal" and make it very clear that you have no idea what you're selling. Ignorance is not an excuse from the law, but it's going to be subjective if it ever does become an issue for you. Although I don't think that it ever would.
Just because LaRue has chosen to limit their market, doesn't mean you're required to.
I worked supply for the military and we used to DRMO (sell) a bunch of "military only" stuff. Weapons had to be de-militarized, refrigerators had to be certified free of refrigerant, and hard drives had to be fragged. Other than that, we sold every damn thing to the general population.