Does anyone know what the compatibility between the XCR and the AR is? For instance, can you attach an AR upper to an XCR lower or vice-versa? I'm guessing no, but it'd be really neat if you could.
Nevermind, the XCR has a completely different cut on the upper/lower meet than the AR.
I can't believe I didn't look for something that simple the first time.
Blah.
Mods, please close.
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