Rearden FHD Flash Hider Features The Rearden FHD Flash Hider is a suppressor-ready flash hider manufactured from 17-4 PH H900 stainless steel and threaded at 1/2x28 with a square shoulder engineered for direct compatibility with Atlas Atlas XL and Plan B suppressor mounting systems for shooters who want a muzzle device that delivers flash suppression and a reliable suppressor interface in a single package. This updated version features enlarged rear wrench flats that simplify installation and ensure proper torque engagement and the Atlas XL adapter produces no overrun for the most compact suppressor package possible. Shims are not included and may be required for proper timing depending on barrel configuration particularly on barrels where the manufacturer did not provide a thread relief and an alignment rod should always be used to ensure the entire system is set up correctly. The gold heat treat 17-4 PH H900 flash hider achieves its distinctive wheat-toned gold finish through the H900 precipitation hardening process providing the material properties and surface characteristics that make 17-4 PH H900 a preferred choice for high-stress suppressor mounting hardware. All mating surfaces should be cleaned and the muzzle device properly torqued and Rocksett-applied to the barrel before use and shooters should note that use on Q-brand suppressors voids the Q warranty. Rearden was founded on the mission to be great and innovate and the FHD reflects that commitment in a flash hider built to perform at the absolute limits of what a muzzle device can deliver. Rearden FHD Flash Hider Specifications Manufacturer: Rearden Model: FHD Flash Hider Type: Flash Hider Thread Pitch: 1/2x28 Shoulder: Square Material: 17-4 PH Stainless Steel (H900) Finish: Gold Heat Treat Suppressor Compatibility: Atlas Atlas XL Plan B Overall Length: 1.723 Atlas XL Adapter Overrun: None Wrench Flats: Enlarged Rear Shims Included: No Note: Use on Q-brand suppressors voids Q warranty