[dsspro]

There is 3-4 quick change systems that are not interchangeable.
The cage code calls for General Dynamic.

 

[Mr.Maim]

OP's barrel is an M2A1

QCB Barrel Comparison: Understanding the channels is critical to determining what variant of the M2A2 you are dealing with. Top to bottom: Standard M2HB showing full threads and no pin or channels; M2A2 (29186) QCB Stellite-lined, note the interrupted threads and the channel is longer to the front than on the other two M2A2 types; M2A2-N this is the Norway contract, Stellite-lined. It has shallower threads than the NATO model. Note the difference, it’s important. M2A2 NATO non-Stellite lined with smaller thread diameter, it’s proprietary to the system; U.S. M2A1 with the locating locking pin on the barrel (bottom).

 

[Freedommachine]

Nobody needs an M2A1 barrel? I will take offers on it if you don't have a standard M2 barrel to trade.

 

[Freedommachine]

Updated to sell or trade.

 

[Freedommachine]

Bump, price dropped to $650