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The bolt/carrier, barrel extension and upper receiver are all specific to the WSSM on the AR-15. The uppers do function perfectly on an unmodified AR-15 lower. The bolt and barrel extension was made large enough to accept the huge head on the WSSM. Magazine length gets to be an issue...

I plan on doing some custom AR-10 uppers in them. Now I've heard DPMS is putting one of their LR rifles out in .338 Fed. and ArmaLite is currently working on one. I just ordered the reamer and dies for a wildcat in .338 based on the WSSM case. I'll be able to build AR-15 uppers on that...

I didn't see: .17/.223 .17 Predator 6 WOA (necked down 6.8 SPC) .25 x 45 (.25/.223) .223 WSSM .243 WSSM .25 WSSM 6.5/.243 WSSM And for the AR-10 I didn't see .338 Federal .358 Winchester I've built a few of the .358 Winchesters and am about to launch into building some more...

I believe that the WSM case-heads are all the same as well. .223 WSSM, .243 WSSM, .25 WSSM, 270 WSM, .300 WSM.........

The 6 x 45 (6 mm/.223) Very accurate, about 30% more energy than the .223 and it works great on the AR platform.