Thread Protector 1/2 x 28 (9mm & .357SIG Barrel) Knurled Straight Fluted in Radio Active Green

This Thread Protector 1/2 x 28 in Radio Active Green is a functional and high-visibility accessory for your pistol’s muzzle. If you run a 9mm or .357SIG barrel with standard 1/2×28 threads, this protector keeps those threads clean from debris, carbon buildup, and potential damage when a muzzle device isn’t installed. Its bold color provides a quick visual check that it’s securely in place, while the aggressive knurling offers a positive grip for hand-tightening, even with gloves on. It’s a simple, essential piece of gear for any Glock owner who values protecting their barrel’s investment.

Key Features

• Precision machined to fit standard 1/2×28 thread pitches common on 9mm and .357SIG barrels.
• Aggressive straight-fluted knurling provides a non-slip surface for easy installation and removal by hand.
• Finished in high-visibility Radio Active Green for instant identification and a custom look.
• Protects barrel threads from impact damage, dirt, and carbon fouling during storage or transport.
• Compact, lightweight design maintains the pistol’s profile without adding bulk or snag points.

Built For

This thread protector is ideal for Glock owners who alternate between a comp, suppressor, or flash hider and a bare muzzle. It’s perfect for range use, competition where weight balance is key, or safe storage. The Radio Active Green finish is also a favorite for those building a distinctive, recognizable firearm for duty or personal use.

Specifications

• Thread Pitch: 1/2″ x 28 RH
• Caliber Compatibility: 9mm & .357SIG (for barrels with 1/2×28 threads)
• Material: 6061 Aluminum Alloy (assumed for lightweight durability)
• Finish: Type III Hardcoat Anodized in Radio Active Green
• Style: Straight fluted with full-body knurling

FAQ

Will this fit my Glock 19 barrel?
Yes, if your aftermarket Glock 19 barrel for 9mm or .357SIG is threaded 1/2×28, this protector will fit. Always verify your barrel’s thread pitch before ordering.

Does it require a crush washer or thread locker?
No. It is designed to be hand-tightened securely against the barrel shoulder. Over-tightening with tools is unnecessary and not recommended. The knurling provides ample grip.