Description
Adapt a 1/2-28 barrel to accept 5/8-24 devices. Precision 17-4 H1150 stainless Gen 2 adapter with black nitride finish—ready for brakes, comps, and suppressors where legal.
This Gen 2 adapter bridges a barrel threaded 1/2-28 (common on .223/5.56 and many U.S. 9mm hosts) to 5/8-24 (the common .30-cal standard used on .308/7.62, .300 BLK, etc.). No rethreading required. Precision-machined from 17-4 H1150 stainless for strength and concentricity, it seats square to the shoulder for a secure, repeatable mount. Add your preferred muzzle brake, compensator, flash device, or a suppressor with a 5/8-24 mount (where legal and properly registered).
Gen 2 upgrades include tighter concentricity control, refined shoulder geometry, and a durable black nitride finish for wear and corrosion resistance.
Key features
• Converts 1/2-28 (RH) barrel threads to 5/8-24 (RH) external threads
• Concentric Gen 2 geometry for alignment and repeatability
• 17-4 H1150 stainless steel body for high strength and heat resistance
• Black nitride (QPQ) hard finish—wear and corrosion resistant
• Square, positive shoulder interface; suppressor-ready when properly aligned
• Reversible, non-permanent solution—no barrel machining required
Compatibility
• Barrel/muzzle input: 1/2-28 RH (typical .223/5.56 AR-15, many 9mm carbines/pistols)
• Device/output: 5/8-24 RH external threads (common .30-cal devices: .308/7.62, .300 BLK, etc.)
Notes: Ensure your barrel has a proper, square shoulder for best alignment. Adapters change thread size—not bore size. Always verify device bore is appropriate for your caliber (e.g., .30-cal device on .223 is generally fine; the reverse is not). For suppressor use, confirm concentricity with an alignment rod before live fire.
Materials and finish
Body: 17-4 H1150 stainless steel
Finish: Black nitride (QPQ) hardcoat
Included
• 1x 1/2-28 to 5/8-24 Thread Adapter – Gen 2
Usage notes
• Thread directions: both sides are right-hand (RH).
• Do not place a crush washer between the barrel and adapter; the adapter should seat flat on the barrel shoulder/face.
• Time any brake/comp on the 5/8-24 device side using shims if needed.
• Avoid stacking multiple adapters.
• Follow all federal, state, and local laws and range rules.
