The title tells any Gauntlet user everything they need to know, for the rest of you I offer the following. My rifle is as the title says, an Umarex Gauntlet rebuilt and tuned by Hajimoto Productions. Rifle stats: Reduce hammer stop by 5/16" (HTVS) Replace valve poppet with high-performance poppet (STK) Add end cap power adjuster 5/64" Hex (STK) Add power adjuster hole in the stock (STK) Increase transfer ports in both receiver and barrel to 80% of bore size Increase regulator pressure to 2100 PSI Barrel breech chamfer and bevel Barrel crown retouch and polished Barrel lapped and polished Barrel shroud ventilated Barrel shroud diffuser installed Baffle replaced with 5 piece HP Baffles (SSP) Air stripper replace with HP Air Stripper (SSP) Installation of the HP Barrel Band. Trigger to sear face polish and lubricate Polish hammer Polish hammer tube section Trigger adjustments made Trigger 3rd washer removal Trigger return spring replace (lighter) DonnyFL Sumo Silencer I'm sending these 34.9 grain NSA slugs 150 yards with an 896 FPS average into a 1.25" group according to the rangemaster signed & certified targets at Ben Avery Shooting Facility in Arizona, 5-18-2021. Partly cloudy, Humidity 16%, Temp. 81F, Winds SW at 10 to 20 mph. Cease fire vid on youtube. Ridiculous, just ridiculous how accurate that combo is. Great job! Can't wait to fire something in the 25 grain range as I have the best harmonics with a 25 grain projectile. I will purchase again, and again, and again.