At this point just get a proper SMG? Not like it's gonna cost any more.
cause the kit is cheaper then SMG, the whole kit is just milled aluminum, it doesn't have a extended barrel of something ,it is just a shell , and most of the cost for any given gun is the bult , barrow , trigger block , not the housing that these part are apart of.
Think it this way , the lower reviver and the hand guard of the M16 can be made with 3d printed plastic and it would still function just fine, but the critical parts have to be made in factories.
Analogy , this kit is a phone case ,SMG is a new phone.