BR3 valve body calibration stock?

ddevito

New Member
Joined
Jan 18, 2023
Picked up a 200-4R no tag on tail end pulled pan to see at first an "AK" further disassembly realized it was not actual coded side which had a barely legible "BR3"
how do I verify valve & spring calibration sizes for BR code . also what is the AK stamp in yellow on passenger side? I have several CQ & CZF's one OZ never seen both sides
stamped .
 
realize this thing is modified has 3 small Allen head plugs ,may go to part sale board ..maybe some can figure out mods not me
 

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