Dead Air Rimfire Accessory Thread Spacer 1/2-28 1212231. This spacer reduces baffle erosion and features internal threads to remain securely affixed to the barrel even when the suppressor is removed. Specifications for Dead Air Silencers Dead Air Rimfire Accessory 1212231: Manufacturer: Dead Air Silencers Color: Black Condition: New Size: 1/2-28 in Features of Dead Air Silencers Dead Air Rimfire Accessory: Optimized for barrel threads exceeding the standard 0.4-inch length Ensures proper blast chamber space for improved performance Reduces baffle erosion during use Features internal threads for secure attachment when suppressor is removed Specifically designed for use with the Dead Air Mask silencer Package Contents: Dead Air Silencers Dead Air Rimfire Accessory