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9/22/2017 12:11:25 AM
Posted: 9/16/2005 9:08:54 PM EDT
Hi. I know that the AR-15 is composed of an upper, reciver, and lower. I was wondering exactly what these terms mean, that is to say what they are. Are uppers or lowers interchangeable between different rifle manufactures? Thanks.
Link Posted: 9/16/2005 9:12:23 PM EDT
you have an upper receiver and a lower receiver. the upper receiver holds the bolt carrier, charging handle, and bolt. the lower contains the trigger components and all that jazz.
Link Posted: 9/16/2005 10:40:34 PM EDT
So is the upper and lower both parts of a receiver?
Link Posted: 9/16/2005 10:44:07 PM EDT
you put the upper and lower receiver together to form your rifle.
Link Posted: 9/16/2005 10:48:38 PM EDT
Link Posted: 9/16/2005 10:50:00 PM EDT
To be a bit more specific, only the lower receiver itself is the part that is considered a firearm.
(NFA parts not withstanding...don't even worry about those!)

The upper receiver/barrel assy. uses two pins to attach to the lower.
You'll probably end up with a few of these!
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