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The Heat-Treated Castle Nut screws onto the AR15/M4 lower receiver extension (buffer tube) and keeps the receiver extension and lower receiver end plate secured in place. The large notches allow for positive engagement with a castle nut wrench for proper installation and torque. The smaller notches provide a location for the end user to stake the castle nut to prevent accidental loosening.
Finished in a Mil-spec manganese phosphate.
The 9mm Silent Captured Spring is a drop-in component that softens recoil and reduces cycling noise and vibration in your 9mm carbine. The result is a refined rifle that's a pleasure to shoot. Paired with our 9mm bolt assembly, you have the most reliable 9mm operating system available. The 9mm Enhanced Version provides the same buffering mass as our standard 9mm SCS. At the same time, we've increased overall bolt mass slightly with more room for increased weight if needed. The result is even softer recoil thanks to a further delay in blowback.
HIPERFIRE PDI Trigger