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Discussion Starter #1
ive seen some people are getting the new MR223A1's with a build code of BB and they are now interchangable uppers with other AR15's..
as shown in this video
20120309231850.wmv - YouTube

what other changes do the A1's have? any links to info?

i assume a HK416 upper would now fit directly on the MR233A1 lower?
 

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Interesting.

Which country is he in? I wonder if the pin change is region specific still or if all MR223s will have this feature from now on or will some regions still have the offset pins.
 
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