AR MAGLOCK KingPin for Gen 2 & Gen 4 AR MAGLOCK systems on AR-15 .223 / 5.56 platforms. The KingPin allows for minimal separation (action disassembly) of the upper and lower receivers. The new KingPin holds the upper receiver from flying open when disassembling the action. Just a simple push on the pin with your thumb opens the action for mag changes, then automatically re-locks when you push the receivers together.
The KingPin benefits:
Keeping your critically important bolt catch
Seamless double feed clearing
Bolt hold back on last round
Fast magazine changes (as fast as OEM mag release button)
Clear access to your safety selector
Easy removal from the receiver to fully open the action