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BM compatability in McMillan A3-5?

bearring

Private
Minuteman
Jan 11, 2020
72
6
Ok so I'm on the bottom of a learning curve here. I got a McMillan stock A3-5 that's been bedded. I could have got it with a Hawkins m5 BM. It's got the pillars in the stock bedding. I didn't realize I needed one, my setup is currently in a PDC Chassis. What BMs compatible? All? Some? Thanks!!