Just got this Spike's .22LR upper and 6 BDM full size Ciener mags. I set the upper up to closely match my 12.5" 6.8SPC setup. Spike set up the barrel a bit too long, but it's close enough for government work (as the saying goes).
I put a little Slip2000 EWL on the Ciener rails and hand cycled the bolt about 50 times. Then I ran 180 rounds through the upper across all 6 mags. No mag or upper related failures at all - just one round that failed to ignite (probably the ammo). Shot Aguila 38gr copper washed. Single ragged hole at 20 yards (indoor pistol range) shooting off a bipod.
I'll be cutting the mag springs by 1" as suggested by BDM. Right now, it's very hard to load more than 22-23 rounds into the mags.
What a great combination - I'll be shooting this thing like crazy over the winter.
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