Near Manufacturing make a bridge mount with integral bottom rings............in steel.

Hi Jim, what would you do? Build a set of custom bases with offset holes to match the bad alignment?

The first thing that came mind for me was weld up the holes and surface grind the action, then re-drill them in the correct location. But, then I wondered if just a new action might be a cheaper alternative. The VZ-24 is pretty common.

Terry

This is what I would do if the action is dear to your heart. First the basic steel stock needs to be contoured to fit the receiver, next, I would set the receiver up in the mill vise, level it, and indidcate in all of the original holes and record the positions taken from my DRO. The bases are then set up on the receiver and (horrors) super-glued on. Then go back to your dimensions and drill the attach holes through. Careful you don't go too deep and remove the old tapped holes; you could make them 8-40's here if you wanted. Next, the bases are attached with the torx screws and milled to final dimensions to fit the Tally rings. I believe this is the only way to get 100% repeatability with QR rings. The secret is milling the dovetails while the bases are attached to the receiver.

Problem fixed and a nice set of custom bases. Sounds like a plan to me.

Thanks,
Terry

I am posting a pic of the custom bases that D'Arcy Echols makes for his rifles. Enjoy.

Those are nice and they are custom but, if you go back and read his original thread, he states the action bridges are off. No amount of custom rings will accomplish what he is trying to do. It is the bases that need to match the receiver holes. If those echols rings were line bored true to the receiver then they would work as wanted. But, I don't think they were.

If you have the front and rear bridge surface ground it will be
parallel to the center line of the action. The radius will be known
and the underside of each base made to match. I think that's what a
custom base is ?

Heres how the Echols rings start out, it makes little difference as to how "far out" the front and rear bridge are we have plenty to work with‏

More than likely it has nothing to do with the reciever being level and more to do with the holes being drilled off center. Grinding the bridge probably won't fix the whole problem and trying machince a ring with an integral base and off center mounting holes only complicates the solution to the problem. If the bases are fit to the action even with the offset holes the tops can squared and the dovetails cut while mounted to action to ensure everything is square.

Like this:
first the bases are cut.

Then the holes are indexed and drilled like Jim explained.

After that the bases are squared and dovetailed while attached to the receiver.

Now the product is finished the bases are square with the receiver.




Terry

PS. Above work was done by Shane Thompson.

Misalignment of the rear bridge with relation to the front ring will be corrected if the two radii are surface ground true to bore line.

Minor hole misalignment can be corrected by punching out the existing 6-48 holes to 8-40 true to bore line. Gross misalignment requires the base holes to be offset from bore line.

Echols mounts are fit individually to each receiver after the receiver has been trued (front ring and rear bridge ground true, mounting holes drilled/tapped true to bore line). Then the mount's scope bore and base radius can be bored in line in one set up. The holes are then drilled/counterbored in line to the scope bore/base radius.

Brian

Well, maybe it's a job for Mr. Echols then.

Terry