Fletcher Rifle Works ST-GP1 Glasspack Hider 1/2x28 SIG Taper

The Fletcher Rifle Works ST-GP1 is a Glasspack-style muzzle hider from Fletcher's direct-thread muzzle line, threaded 1/2x28 with the proprietary SIG taper shoulder for direct mounting on SIG-pattern barrels.

Built for SIG Sauer firearms and any host sharing the 1/2x28 SIG-taper thread specification, the ST-GP1 uses the elongated, non-cylindrical Glasspack housing that gives this line its name. The compact, oblong footprint sets it apart from conventional round muzzle devices and is intended for hosts where blast control and a low-profile fit are both priorities.

The SIG taper shoulder locks into the corresponding SIG-pattern barrel interface for a secure, repeatable direct-thread mount that does not require additional timing shims. A direct-thread installation keeps the overall package short while still providing the gas-flow characteristics the Glasspack housing is designed around.