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The M4/M16/AR15 is the most popular airsoft rifle in the United States. That's not surprising considering that it's the primary assault rifle used by the U.S. military. So chances are you probably have an M4 rifle or its variant. This article shows you how to disassemble this rifle. From this point forward, we will use the term M4 to identify the M4 rifle and all of the variants.
The receiver is the main body block at the center of the M4 rifle. The receiver can be separated into two: the upper and lower receiver. The upper receiver is the attachment point for the front rail/handguard, the external barrel, the inner barrel, and the hop-up. The lower receiver carries the gearbox, the rear shoulder stock, motor, and handgrip.
To separate the receiver, tap out the receiver pin at the front of the receiver, right under and behind the rail/handguard. The photo below shows the receiver pin tapped out slightly.
Once the receiver pin has been completely tapped out, you can pull the upper receiver forward, while pulling the lower receiver backward. On some M4 airsoft guns, it is very tight. You can put the forward assist button to good use in this case.
The forward assist button is the round button on the right side of the upper receiver. It does nothing on an airsoft gun (at least on most airsoft guns; some realistic training airsoft rifle make use of it). Hold the handgrip with your right hand. Hold the rail/handguard with your left hand. Use your right thumb on the forward assist button. The receiver should separate with some pressure.
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