5.56 - .22LR upper swap?
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5.56 - .22LR upper swap?


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Old 10-09-2012, 04:04 AM   #1
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Default 5.56 - .22LR upper swap?

I'm still learning about AR's and I was wondering when I get one (a 5.56), can I swap out the upper to a .22LR upper from the 5.56 and will it work? Would I need to change/swap anything else out besides the upper?


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Old 10-09-2012, 09:53 AM   #2
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A standard lower can have a .22 upper added- will need a different magazine. MOST 22 LR lowers cannot have a 5.56 upper. There is a size difference (width) and .22 LR has no buffer, different bolt setup, etc.


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Old 10-09-2012, 02:55 PM   #3
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Some .22 upper manufacturers (CMMG, Spikes) recommend a rounded hammer vs a notched one. That swap shouldn't effect 5.56 functioning.
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Old 10-10-2012, 03:46 AM   #4
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You can get one of the drop-in kits.

http://www.brownells.com/.aspx/pid=27008/Product/CMMG-AR-15-22-LR-CONVERSION-KIT

Be aware shooting lead .22 fouling will clog the gas tube.
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