Quote Originally Posted by SwL_Wildcat View Post
Are just uppers going to be available and if so will they fit the early MR223 lowers? I'd love to put a 11" on my MR223 as needed...
The original, very first European MR223 is proprietary. That wouldn't fit anything other than its own upper.

If your upper uses 'commercial extension tube" and have a bevelled shoulder on the barrel where the flash suppressor screws on, it is likely you have a very early MR223 with proprietary lower.