I hear that all Bushmasters come with the M4 Black insert for extractor spring! And that they dont use the BLUE inserts?? Reason Im cofused is That I bought a Bushy Parts Kit and it has the Blue Inserts?? Do all Uppers have the Black insert!
My bushy upper has the blue one and I also have put over a 1000 rounds through since I had any problems. Those were not the extractor, I was ripping the side of the case off. Then one day it just went away. weird. The blue ones work fine. Scott