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Posted: 7/9/2003 8:15:06 PM EDT
This may be a dumb question, but I am new to the AR's and just purchased my first AR-15 (a RRA M4gery w/16" barrel). I was curious if I can just swap uppers - say an upper with a 20" barrel, or if I have to do something else to be able to use a different upper.
If it will work, are all uppers compatable, or do I need to stay with a RRA upper?

Thanks!
Link Posted: 7/9/2003 9:00:50 PM EDT
Yup - you can switch to your hearts content. I have a Colt M4 that I switch the lower with the Eagle Arms lower I built with an ACE Stock. Sometimes I switch the lower out of my Bushmaster Varminter with the Eagle Arms for kicks and with the Colt, either lower or upper, I forget, but it always works out. [img]http://www.fototime.com/C51819B1E0AE20E/standard.jpg[/img]
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