https://www.gunbroker.com/item/1040915611I don’t think I have ever seen a flat bolt with standard bases. Wonder if this one was drilled and tapped. It’s got some screw plugs in the top of the barrel that I think I’ve seen on other Varmint models.
I wonder if the serial numbers on the bolt match the receiver?
Redfield made a base grooved to fit over the Ruger rib, fastened by drilling and tapping for screws.
Bruce
The base looks marked as Redfield , bcp.
I have a flat bolt varmint in the safe in 6mm REM. Took a look and it takes the regular Ruger rings but it is also tapped but only at the front not the rear. It’s tapped midway down the barrel with 2 plugs like this one also. Not sure why they tapped them this way.
You can see the scallops for Ruger rings under the edge of the base.
I also had a flat bolt in 22-250 at least 25 years ago. I was offered a McMillan stock for it at a reasonable price. Turns out the inletting for that flat bolt was different than subsequent SA Ruger 77s. McMillan said they never inletted for those older flat bolts.
I have a flat bolt varmint in the safe in 6mm REM. Took a look and it takes the regular Ruger rings but it is also tapped but only at the front not the rear. It’s tapped midway down the barrel with 2 plugs like this one also. Not sure why they tapped them this way.
For unertl type bases and scope.
![[Linked Image from i.postimg.cc]](https://i.postimg.cc/sX2X0xx8/IMG-6934.jpg)
You can see the scallops for Ruger rings under the edge of the base.
Yep! Someone D&T the rear receiver bridge to accept the Redfield base.
Good Guys is only a couple of miles from me. If you'd like me to check it out, I'd be happy to do so.
Probably a Redfield JR-77 base.