Angstadt Arms HUB 1/2x28 Booster Assembly – Pistol Caliber Carbines

The Angstadt Arms HUB 1/2x28 Booster Assembly is a Nielsen device designed to ensure reliable cycling in pistol-caliber carbines and firearms with tilting barrel actions when running a suppressor. The booster decouples the barrel from the suppressor during the cycling process, allowing the barrel to recoil freely and actuate the action—critical for semi-automatic pistol-caliber firearms that depend on barrel movement for reliable function.

This assembly features the industry-standard HUB (Hub Universal Booster) thread pattern, making it compatible with a wide range of HUB-compatible suppressors. Machined from durable materials with a corrosion-resistant finish, the unit threads directly onto 1/2x28 TPI muzzles commonly found on 9mm and .22 LR barrels. Installation is straightforward: thread the booster onto the muzzle, then attach your HUB-compatible suppressor. Note that this is a booster assembly only—suppressor sold separately. Verify compatibility with your specific firearm and suppressor before installation.

• Type: Booster Assembly (Nielsen Device)
• Thread Pitch: 1/2x28 TPI
• Suppressor Mount: HUB Universal Pattern
• Material: Steel
• Finish: Black
• Compatible Firearms: Pistol-caliber carbines and firearms requiring a booster for suppressed operation