Which mounts MFR and Alpex 4K?

[angrybear]

Is it shrouded or 16mm barrel ?

To make life easier your best way would be to fit a picatinny rail, (Dr Bob) so that you can use any off the shelf picatinny mount.

Because of the short Rapid block you have an extra 10mm height drop to the top of a 16mm barrel, but only 5mm with a factory shroud, add on 5mm for the rail & you could have 15mm which might let you fit low mounts.

You need to know the OD of the objective, take off the tube dia (30mm) & divide by 2 that gives you the min mount height required on a level surface,
but as I say you could already have 15mm due to the shape of the rifle.

One thing that would worry me is the size & position of the turret saddle which might foul the magazine.