The Surefire Enhanced Bolt Carrier Group (BCG) is designed by James Sullivan to address reliability issues in short-barreled AR-15 platforms. It features a longer carrier body, a shortened gas key, and a proprietary buffer system that increases dwell time by approximately 15% and extends the carrier's stroke length. An internal anti-bounce weight ensures stability during full-auto fire. This upgrade is highly recommended for SBRs and automatic fire applications.
The Ultimax Mk3 light machine gun, designed by Jim Sullivan for Singapore, features a revolutionary 'constant recoil' system. This design significantly reduces felt recoil and muzzle climb, making it exceptionally controllable, especially during full-auto fire. While highly effective, its benefits are primarily for automatic fire, limiting its adoption in semi-automatic platforms and facing inertia from established military weapon systems.
The Ultimax Mark II, designed by Jim Sullivan, features a revolutionary 'constant recoil' system that significantly reduces felt recoil and muzzle climb, allowing for exceptional stability during full-auto fire. While its proprietary 100-round drum is effective, adaptations for STANAG magazines proved problematic due to wobble and reliability issues. The Mark II's fixed barrel could overheat, a flaw addressed in the Mark III's quick-change barrel system.
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