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im not sure if my 6.8 upper is SPC or SPCII. i have always shot normal SPC rounds and it has worked fine with an occasional jam here and there (i think due to crappy mags). i have a box of SPCII that i have not shot yet. is it ok to try it out in the gun? i guess im asking if 6.8 SPC uppers can shoot both cartridges?
