Ar-15 M4e1 Lower Bolt Catch Pin

The AR-15 M4E1 Lower Bolt Catch Pin from Aero Precision is a critical component designed for shooters who demand reliability in their M4E1 rifle platform. This small but essential pin serves as the pivot point for the bolt catch mechanism, which stops the bolt carrier group in the rearward position when the magazine runs dry or a round fails to feed.

Constructed from quality steel with proper heat treatment, this OEM-spec pin resists wear and deformation better than inferior aftermarket alternatives. Its precise geometry allows the bolt catch lever to rotate freely while maintaining tight engagement with the upper receiver's bolt catch notch, ensuring consistent operation under various shooting conditions.

This bolt catch pin is particularly beneficial for those building or maintaining M4E1 lower receivers, including law enforcement armorers and military gunsmiths. Its minimal weight of 0.01 lbs reflects the pin's compact design, which is crucial for maintaining the lower receiver's assembly balance and ensuring reliability.