Rear Receiver Pin Delta Armory M4 / AR15 — Grey

The rear receiver pin is the small part that closes the AR15 lower, allowing it to be opened for cleaning and maintenance. This Delta Armory part, 30 mm in length, is made of metal and is compatible with M4, AR15 and M16 AEG airsoft guns with a standard receiver.

Replacing a worn or lost pin with a metal one, rather than resorting to makeshift solutions, restores the correct fit between the upper and lower receiver: a pin that is out of tolerance introduces play between the two halves, resulting in a less secure grip and, over time, accelerated wear on the contact surfaces. The metal pin maintains stable dimensions even after repeated opening and closing cycles.

It is worth checking the dimensions of the original pin fitted to your airsoft gun before purchasing: M4/AR15 AEG replicas generally follow the same standard, but some aftermarket versions or lesser-known manufacturers use pins with a slightly different diameter or length. Compatibility depends on the specific receiver, not just the stated platform.

Key features

• Metal construction: does not deform with repeated use like plastic or die-cast zinc pins
• Length of 30 mm, conforming to the M4/AR15/M16 AEG receiver standard
• Restores the correct fit between upper and lower receiver, eliminating play between the two halves
• Direct replacement for AEG airsoft guns: no modifications required during installation

In the box

• 1x metal rear receiver pin M4/AR15, grey