Yes, you can have different uppers for any of the we Gbbrs that split like that.
Can you find another? That might be harder for a pdw or scar than an m4. If you do...it should work. Also...there aren't many/any outer barrels for them (there may be now, but I don't think that there'll be much choice)...so that may put a dent in your plans beyond just adding a silencer.
You might find a broken gun to salvage another upper...however, with the costs of new ones, you're pretty good just buying another new one for the setup. Unless a fixer one comes with a bunch of mags, then it'd be worth considering.
While the scar looks bad ass...I think that it suffers from an inherent design flaw in how the trigger mech sits in the plastic lower. It doesn't sustain the forces of the gun well. Also, there are design issues with the stock back plate breaking....but there are metal ones readily available so that's an easy fix.
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