Comstock Armory Extended Plan-B Flash Hider, 1/2x28, 9mm, Black Nitride The Comstock Armory FHXL-12-9-PW is an extended flash hider combining 1/2x28 barrel threads, a Plan-B-compatible suppressor interface and a predrilled pin-and-weld design. Its extra length is intended for professional pin-and-weld applications on 13.7- and 13.9-inch barrels. Buyers comparing extended muzzle devices get a clearly specified configuration rather than a standard-length flash hider with an unspecified extension. The FHXL uses 17-4 PH stainless steel with a black nitride finish. A 0.750-inch rear profile matches the contour of common AR15 barrels. Although the 1/2x28 configuration is offered for 5.56/.223 barrels, the muzzle-device bore accommodates bullets up to 9mm, including .350 Legend, subject to compatible barrel threads and the complete system's requirements. Select the extended configuration with the correct barrel interface. Purchase the Comstock Armory FHXL-12-9-PW at BattleHawk Armory. Extended Profile and Pin-and-Weld-Ready Design The FHXL measures 2.94 inches overall and adds approximately 2.3 inches beyond the muzzle. Its predrilled feature distinguishes it as a pin-and-weld-ready component. The intended barrel-length application is a starting point for professional evaluation, not a blanket guarantee of the finished measurement. A qualified gunsmith should confirm the final configuration before permanent installation. Flash-Hider Function with Outward Gas Direction The FHXL reduces muzzle flash and directs expanding gas outward to help limit wear on a suppressor's blast baffle. Rotational symmetry means the device does not require timing to a specific clock position. These features keep the extended configuration focused on flash reduction and compatible suppressor mounting rather than treating it as a dedicated recoil brake. Compatible Adapters and Clearance The .900-24 interface is compatible with appropriate Comstock LPA, Q Plan-B and Rearden Atlas adapters. An extended muzzle device requires attention to the suppressor's available internal clearance; a matching interface does not by itself establish fit. Confirm cartridge suitability, complete-system alignment and the suppressor maker's aftermarket-mount warranty terms. The FHXL is a muzzle device, not a suppressor or suppressor-side adapter. Product Specifications Manufacturer: Comstock Armory Model / SKU: FHXL-12-9-PW UPC: 850069580179 Product type: Extended Flash Hider Barrel threads: 1/2x28 Bore capability: Up to 9mm; includes .350 Legend Suppressor interface: Plan-B-compatible .900-24 Compatible adapter families: Comstock LPA, Q Plan-B, Rearden Atlas; complete-system fitment required Material: 17-4 PH stainless steel Finish: Black nitride Overall length: 2.94 inches Approximate length added beyond muzzle: 2.3 inches Weight: 3.3 ounces Wrench flats: 3/4 inch Timing: Not required; rotationally symmetric Rear profile: 0.750 inch Pin-and-weld provision: Predrilled; intended for 13.7- and 13.9-inch barrel applications Included Item One Comstock Armory FHXL-12-9-PW muzzle device. Frequently Asked Questions Is the FHXL-12-9-PW limited to 5.56mm bullets? No. Its bore accommodates bullets up to 9mm, including .350 Legend. Barrel threading and the suppressor's cartridge rating must still match the intended configuration. Does the extended flash hider require timing? No. The FHXL is rotationally symmetric and does not require timing with shims. Is this product already pinned and welded to a barrel? No. This is the separate, predrilled muzzle device. It is not a barrel assembly or a completed installation. Choose the Comstock Armory FHXL-12-9-PW at BattleHawk Armory when an extended profile, defined Plan-B compatibility and a black nitride finish are priorities. Explore Comstock Armory accessories at BattleHawk Armory. Shop the Comstock Armory FHXL-12-9-PW at BattleHawk Armory.