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Any autococker +pre-2K backblock will use pre-2K bolts.
Any Autococker +2K+ backblock will use 2k+ bolts.
2K+ backblock + pre-2K bolt will not allow the ball to properly feed into the breach.
pre-2K backblock + 2K+ bolt will not come all the way forward, and so you will have MASSIVE blowback up your feedneck.
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