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Old September 29, 2012, 12:23 PM   #25
jaymce
Senior Member
 
Join Date: July 5, 2007
Posts: 267
The CMMG dedicated upper (I bet most dedicated uppers) use a straight blow back system so the gas tube is not needed.

I get great accuracy with mine but agree anything over 15-20 rounds in a mag become dificult.

I have not tried them in the CMMG upper but if the S&W 15-22 mags fit and worked then that might be the trick as they have a thumb slider to help take the pressure off the spring when loading.

I like the 15-22 I shot but it did not have the same feel as my AR, for the same $ like being able to have about the same combo in .22 and 5.56/.223 while retaining the use of the lower for both uppers.
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