Rear Takedown Pin Not Fitting Free And Allow

This was the case with the SLAP Plate and also the Magpul ASAP weve used in the past.

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Believe it or not these are some of the most important pieces of the entire Lower Receiver and are the cause of many puzzling AR-15 issues.

The differences are typically that the Commercial tube is made from extruded aluminum rather than forged aluminum like the stronger Mil-Spec tube.

The two differ in size as well and youll find more aftermarket stocks built for the Mil-Spec tube.

Rear Takedown Pin Not Fitting Free And Allow

This is done to ensure the Castle Nut doesnt work free and allow your Receiver Extension to turn.

Four of them are available and optimally you should at least try to stake in two spots if possible.

With many of the newer sling plates and their flared orientation, you may not be able to get more than one spot staked.

That was the case with our IKICKHIPPIES SLAP Plate as well as the Magpul ASAP weve got on another build.

The Castle Nut is also a great place to add a witness mark, particularly if you leave it unstaked.

As your gas tube is shortened (From Rifle Length to Mid-Length to Carbine Length) it becomes more important to utilize a heavier buffer to regulate the added pressure pushed into the Bolt Carrier Group by a Direct Impingement system like were building here.

This delay can help with earlyhard extraction problems which occur when the bullet hasnt departed the barrel and theres still built up pressure in the cartridge case.

Heavier buffers can also help to control bolt bounce, which is the bounce that occurs when the Bolt Carrier Group returns after making contact with the Receiver Extension.

One last thing to mention here is that underpowered ammunition in combination with a heavier buffer may cause malfunctions.

Press it against the spring, being careful not to bend the spring.

Optimally you want at least two areas staked, but when using some end plates you may have just the top area to stake.