Maximum volume. Maximum silence. No compromises.The Bushmaster Carbon Sound Mitigator – Big Boy* is the absolute peak of sound suppression in the Bushmaster lineup. If your goal is to play as sneaky as humanly possible and make your HPA replica nearly disappear acoustically, this is the Sound Mitigator you run. This is the quietest model available. Period. And only about 166 grams *previously called Compensator Design Philosophy The Big Boy exists for one reason: ultimate silence.By increasing internal volume to the maximum practical size, this Sound Mitigator delivers the highest level of sound reduction possible without adding noticeable weight or negatively affecting handling. Despite its size, the Fat Boy remains surprisingly lightweight, meaning you won't feel it during gameplay — but everyone around you definitely will. This model is trusted and used by top-tier stealth players, including Kicking Mustang, who runs the Big Boy on his SRS / TAC41 sniper setups specifically because it is the quietest option available. Available Size (Model Big Boy) 180 mm / 18 cmDesigned for players who want the absolute best sound reduction available. Compatibility 14 mm CCW (counter-clockwise) M4 outer barrels Plug & Play — no modifications required Compatible with all 14 mm CCW outer barrels (MTW, VSR 10 with adapter, AEGHPA conversions, Gate PTX pistol) Performance Notes (Important) Recommended for HPA replicas onlyAEG and GBB platforms gain minimal benefit from any Sound Mitigator. On HPA, this is as quiet as it gets —the difference is immediately and unmistakably noticeable. Proof & Support Instruction videos available on YouTube: callsign.bushmaster Backed by extensive real-world testing and community feedback Bottom line:The Bushmaster Carbon Sound Mitigator – Big Boy is the end boss of silence. If stealth is your priority and you want the quietest possible HPA setup, this is the Sound Mitigator you choose — no further upgrades needed. FEATURES AND SPECS Key Features Extreme internal volumeLarge-diameter design maximizes sound absorption. Full carbon constructionUltra-light, rigid, and strong enough for serious field use. Studio-grade acoustic foamCustom-cut internal foam rings for maximum suppression efficiency. Integrated "fart flap" systemEliminates air exit noise and pressure pop common on HPA platforms. Hand-built & extensively field testedTested by the builder, teammates, and 1000+ players across multiple countries. Technical Specifications Model: Fat Boy Diameter: 60 mm Length: 180 mm Material: Carbon fiber Weight: Ultra-light (despite size) Mount: 14 mm CCW