There is no provision on the rear of the receiver to receive the extension. The mp15-22 carbine receiver is a one piece unit. Tube is not removable or replaceable without serious modification. I think perhaps that the upper receiver may be interchangeable between the carbine and pistol creating a SBR, regardless of the legality
Last edited by Skunkhome; 01-29-2011 at 10:13 PM.
Reason: Correct typos
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