![]() ![]() These two spring-detent pins can be pulled out of position to allow the gun to split into its two separate receivers, or you can just pull the rear one, which is the takedown pin, and let the gun hinge open on the front pivot pin. ![]() Holding these two halves of the gun together is your takedown pin and your pivot pin. This can allow you to shoot multiple calibers through the same firearm since the bolt, barrel, and chamber are all contained within the AR-15 upper receiver, and the actual firearm is the lower receiver. The major bragging point of the AR-15 is that you can field strip it in about ten seconds, and you can take the whole upper receiver off and swap in a compatible one. This has made the AR platform the go-to infantry rifle for many western militaries (including the US Armed Forces with the M4 and its variants) as well as the most popular rifle with civilian gun owners in the US in general. One of the things that make the AR-15 so popular is the level of modularity you get with the gun.
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