Older browning abolt action size

[argrendel]

i need to buy a 20moa picitanny mount. This is a Browning abolt action in a 6br with a match barrel.
EGW says long action measures 3.86” C to C. Is that center of the front screw of the front mount, and center of the front screw on the rear mount? I have a 2 piece right now.
That is the measurement I get, but I just want to be sure.
Abolt 1 or 2. Not sure.

Thanks.

Terry

 

[argrendel]

Found my problem. The action originated as a WSSM action. Rail ordered.