Wilson Combat Bullet Proof Barrel Bushing Thick Flange Commander Blue. Wilson Combat machined these from top-quality steel for maximum reliability and wear. These Wilson Combat Thick Flange .580 Barrel Bushings are designed for .580 barrels and you'll need to perform minimal fitting for a proper fit. For a more secure fit we recommend using the #617 or #618 recoil spring plug for a more reliable and wear-resistant installation. Bulk up your weapon with the best; install a Wilson Combat Bullet Proof .580 OD Barrel Bushings on your MSR pistol. Specifications for Wilson Combat Thick Flange Bullet Proof Barrel Bushing: Manufacturer: Wilson Combat Condition: New Package Contents: Wilson Combat Thick Flange Bullet Proof Barrel Bushing Wilson Combat 619B: Bullet Proof Barrel Bushing Thick Flange Commander Blue