[crunchiespg]

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?

 

[Grumpy]

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.

 

[crunchiespg]

he's in canada... as am i...