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Posted: 12/10/2003 1:03:37 AM EDT
I wanted to bring my extra 20" upper along to the range to use with my M4 clone. So I wanted to know would I have a problem with the rifle not functioning properly because of the gas system differences between the M4 barrel and a 20" barrel. Since the M4 uses a difference buffering system then an A2 stock I wanted to ask here if I would get a cycling problem if I use the 20" upper on the M4 lower.

Thanks, for looking and all replies.
Link Posted: 12/10/2003 2:49:45 AM EDT
[Last Edit: 12/10/2003 3:30:34 AM EDT by Matt_B]
Leadfoot, I was wondering the same thing myself a little while ago and found out that it doesn't matter as long as the spring, buffer and tube all match. In other words, either all parts are for a collapsible stock or all parts are for a fixed stick. Here's where I got the info from: [url=http://ar15.com/forums/announcement.html?b=3&f=66&id=187][b]Combinations of barrels and buttstocks[/b][/url]
Link Posted: 12/10/2003 2:36:56 PM EDT
Matt_B, thanks for the reply. I thought there might be a difference due to a shorter tube in the 14.5" upper. I just wanted to make sure that the 20" would cycle a round correctly with the shorter buffer system in a collapsible stock than the standard A2 buffer system in an A2 stock.
Link Posted: 12/10/2003 2:57:38 PM EDT
I have fired my 20 inch upper on my Carbine lower without a problem, I kept the short (also heavy) buffer and spring in the carbine.
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