The magwell engraving has transformed, and Colt has rebranded all their carbines as "Carbine" and now not marked M4 Carbine.  This is actually the only transform to the solution.Effectively, there's 2 variants in the 6940P, and also the 1 I had, I am %ninety nine absolutely sure the rings to the piston were similar to the rings on the bolt. I s… Read More