This has always been my preferred setup.. The Freelock
When in CA, screw in red BB nub. When out of CA, unscrew red BB nub. 5 turns in and you have CA compliant BB and 5 turns out and you have a free state mag release. All in 1 unit. And I carry the screw tool in the handle of my weapon.
When in CA, screw in red BB nub. When out of CA, unscrew red BB nub. 5 turns in and you have CA compliant BB and 5 turns out and you have a free state mag release. All in 1 unit. And I carry the screw tool in the handle of my weapon.

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