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Intrepid Tactical Solutions is releasing the AR-12, a 12-gauge shotgun upper that fits on standard SR-25/PMAG type AR-10 lowers. The upper is piston driven. The user must install a stouter, shotgun-specification recoil spring in the buffer tube, but otherwise the lower half of the gun remains the same as an AR-10. An 8-round single stack magazine has been designed to fit in the big AR-10 magazine well.