Does the PRO line work with extended bolt catches?

We made a change to the MK1 PRO upper receiver in early 2020 to allow users to add after-market extended bolt catch/bolt releases like the Phase 5 and Radian Extended Bolt Catch. Please click here to see the lineart of the change in revs.
Please note that the PRO upper does not work with the MagPul B.A.D. lever.
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