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2/20/2010 2:06:00 PM EDT
I just purchased a cmmg 11.5" upper and I plan on putting it on my standard RRA tactical CAR A4,  I guess my first question is what buffer comes from the factory on this model lower and what is the recommended upgrade? Kind of new to the SBR world. Thanks ahead of time.
2/20/2010 3:20:30 PM EDT
[#1]
IIRC they come with a standard weight buffer.   A H-buffer should likely work also if that's what you already have installed.  You may want to add a #60 oring to your extractor as an added reliabitily measure.
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