Scheduled Website Maintenance
We will be conducting maintenance on our website on 24 AUG 2026, and as a result, the site may be unavailable that day. We apologize for the inconvenience and appreciate your patience.
This Item MUST be shipped to an FFL/SOT. Please make sure this item is legal in your area before purchase. We reserve the right to refuse a sale for any reason.
Please email gbsales@alleghenyarms.com with your FFL/SOT contact information.
There are 4 things that open doors. Introducing the K.T.M.S. 12. A barrel mounted Remington 870 AR15 attachment. Originally made famous as the Masterkey, this clone is constructed using modern guns and manufacturing processes. This was a collaboration between Tyr 1 Outfitters as the exclusive distributor and Allegheny Gun Works. The K.T.M.S. 12 will attach to M4 cut barrels both government and SOCOM profile. The barrel hanger mount is of our own design and attached to the barrel via a two piece mount. The The K.T.M.S. 12 will also attach to Daniel Defense Ris II rails via theor integral M203 mounting system. The LMT QD mount is directly compatible and can attach to the unit should the end user choose to swap it out.
