Sig Caliber X-change Kit MCX, 300 Blackout, 16" Barrel - Compatible with Original MCX, NOT COMPATIBLE WITH VIRTUS Out of stock. Check back later... $612.00 MSRP Price: $495.00 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info Caliber X-change kit for ORIGINAL Sig MCX UPC: 798681517442Manufacturer: Sig SauerModel: CALX-MCX-16B-300B Caliber: 300 AAC BlackoutCategory: PartsOtherConversion KitStock: 0Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.