$700.00+ for an M3? You have got to be kidding...
Why waste $700.00+ on a relic that is detuned in the extreme when you can have a MUCH more practical toy for about $250.00?
The Carbine Conversion Unit (CCU) attaches to any modern 1911 type frame, and I believe that it is now available for Glocks, Brownings and Berettas as well.
It comes in a variety of calibers: .45, 9mm, .40, 10mm etc.
It turns your pistol frame into a nearly recoiless pistol caliber carbine.
A couple of my buddies have them, and they are like shooting a big pogo stick. Lots of fun. Stainless barrel, bolt stays open on last round, and easy scope attachment.
I intend to get one (eventually, after all of my other current project guns are done) for my Para P14 frame, which is now languishing unused due to its large size and concealment problems on my scrawny form.
Quite cool for the money, and I would certainly rather have one of these than a quasi-dewat M3 even if the M3 were $500.00 less than it is.
Great truck gun. Easy to suppress if such is legal in your state. Cheap to shoot. Magazine commonality with your other pistols. Pistol frame can be turned back into a pistol in about five minutes.
There are other threads about the CCU on this Forum. Try a search.