Swapping uppers on a lower ok?
I've done it without ever having a problem.
But as I think about it you could POSSIBLY have a cycling problem..
For instance if you're running a 20" rifle length upper with a really lightweight buffer..
And then you switch to a 14.5" carbine length system, you might find you're cycling too fast..
In this case you could keep a heavier buffer around..
This is just an example and may not be what you're doing...just saying that it's possibel
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Last edited by icallshotgun88; 06-27-2014 at 07:39 PM.