The tried-and-true Ambi Arc Fire v2 safeties with the super safe cut triggers included. Our choice when it comes to robust and reliable function for when your being super safe. Includes: M2 tool steel ARC Cam M2 tool steel ARC Lever M2 tool steel ARC Detent Bar 4140 steel ARC Primary Selector 4140 steel ARC Ambi Selector Cam, Lever, and Detent Bar feature DLC coating. Selector Levers feature Black Oxide coating. Includes pre-cut trigger and standard safety detent. Platform Compatiblity: AR-15 Platform - .223/5.56, 300BO, 9mm, 10mm, .45, and .40 CMMG Banshee MP5 Platform - Fits AR-based MP5 lowers, Leber V2 will require the version with safety selector area cutout, normal model support to come later. LEE SPORTING SUPPORT NOT GUARANTEED OR WARRANTIED. G3/91 Platform - Same as MP5. JAKL-15 - .223/5.56 and 300BO - Requires JAKL-15 Slip Trip Kit JAKL-9 - 9mm - Requires JAKL-9 Slip Trip Kit MPX - 9mm (excl. Copperhead) - Requires MPX/MCX Slip Trip Kit MCX - .223/5.56, 300BO, and 7.62x39 - Requires MPX/MCX Slip Trip Kit Kuna - 9mm - Requires AS Designs Kuna Lower Kit (Nexus compatibility unconfirmed) Stribog - 9mm, 10mm, and .45 - Requires AS Designs Stribog Lower Kit Dissent - .223/5.56, 300BO, 9mm, .45, and 5.7 - Requires Dissent Slip Trip Kit Dissent - .308 and 8.6BLK - Requires Dissent Slip Trip Kit and Custom ARC Lever HK MR556A1/A4 - Milspec AR FCG or precut Geissele needed, doesn't require a different bolt carrier. We do not ship to the following states: CA, CO, CT, DE, FL, HI, IL, MA, MD, MN, NJ, NV, NY, OR, and RI.