Shop › RUGGED SHIM KIT .338 3/4X24 M18X51 RUGGED SHIM KIT .338 3/4X24 M18X51 $20.00 Rugged Suppressors Shim Kit, For Aligning Muzzle Devices, Fits 3/4x24 or M18X51 Muzzle Threading SA017 Quantity: Add To Cart Added! Rugged Suppressors Shim Kit, For Aligning Muzzle Devices, Fits 3/4x24 or M18X51 Muzzle Threading SA017