Mounting scope rail

[woofert]

Ok ladies, gentlemen and children of all ages…..

Just got a steel scope rail from Turbothis specially made to fit the CETME/G3 receiver so I’m wondering how to mount it.

If anyone has mounted one by welding it in place, please elaborate.

If anyone has any other ideas, lets hear’em.

Woofert

[rustypirate]

I believe that they have been both welded on and bolted through from the under side of the receiver top...

[bladeworks123]

I've actually done it both ways.....I think the most tried and true way is to spot weld it on. That is what Turbos rails are designed for. Here's one I welded on, I filed a half round notch at each point where I wanted a weld placed with a 5/16 rat tail file, at three points on each side and at the front and rear and then puddle welded the half moon notched areas to the receiver.

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The screw on method requires some more extensive mods to the rail and involves countersinking areas inside the reciever so that the screws will clear, and countersinking the bottom of the rail. I also had to make some special grade 8 screws for the mount, and drill and tap the rail. I say that the welded method is best, only because I have not yet test fired the screw on mount to be sure it is rock solid. I beleive it is, but until I test it I won't swear on it.

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[woofert]

blade,

how did you align the rail with the receiver/bore before welding?

Woofert

[bladeworks123]

The machined groove on the bottom of the rail will pretty much automatically align itself with the center line of the receiver. I used a machinists square, (short leg across the top of the rail and long leg against the receiver rails) checked from both sides to square it to the top of the receiver and the rear sight, marked it and then clamped it in place with a large woodworking hand screw clamp. Rechecked it for square and then tack welded the front and rear, removed the clamp, checked it for square and level one last time and alternately tack welded the spot welds on the sides ( front left, right rear, front right, left rear etc) to prevent it from drawing to one side or the other, checked it again to make certain it wasn't pulling to one side or the other, then finished by puddle welding the notches for the final weld, again in an alternating pattern. (tig welder)