Product Description The Rearden FHD (Flash Hider Device) Tapered Shoulder Flash Hider is a precision-engineered muzzle device built for .375 caliber rifles with M13.5x1 left-hand threads, making it an ideal match for Sig MPX factory barrels. Machined from 17-4 PH H900 stainless steel and finished with a black nitride coating that achieves a surface hardness of 67 HRC, this flash hider delivers exceptional durability and corrosion resistance. The tapered shoulder design ensures full compatibility with Plan B type suppressor mounts, including the Rearden Atlas, Atlas XL, and Q Plan B, with no timing required during installation. This updated version features enlarged wrench flats on the rear for easier installation and secure torque application, ensuring a flush, square fit against the barrel shoulder every time. Product Highlights Premium 17-4 PH H900 Stainless Steel Construction: Offers superior strength, corrosion resistance, and long-term reliability in demanding field conditions. Black Nitride Finish at 67 HRC Surface Hardness: Provides an extremely hard, wear-resistant surface that also creates a tighter, more dependable seal between the muzzle device and suppressor. Compatible with Atlas, Atlas XL, and Q Plan B Mounts: Versatile taper mount interface accommodates multiple suppressor platforms; Atlas XL adapter does not experience overrun. M13.5x1 Left-Hand Thread with No Timing Required: Designed specifically for Sig MPX factory barrels, simplifying the installation process without sacrificing precision. Enlarged Rear Wrench Flats: Updated design feature facilitates easier installation, adjustment, and proper torquing for a secure, square-shouldered fit. Specs Brand: Rearden MPN: 10003 UPC: 850035804025 Caliber: .375 Cal Thread Pitch: M13.5x1 LH (Left-Hand) Material: 17-4 PH H900 Stainless Steel Finish: Black Nitride Surface Hardness: 67 HRC Weight: 0.13 lbs Muzzle Device Type: Flash Hider (Tapered Shoulder) Compatible Suppressor Mounts: Rearden Atlas, Rearden Atlas XL, Q Plan B Recommended Muzzle Device Torque: 15-25 ft-lbs (with Rockset) Recommended Suppressor Torque: 10 ft-lbs Color: Black Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer. ]]>