I got my second Arken SH4 and cantilever mount. I has previously ordered a 20 moa rail for my Gustav 6.5X55 Swede. I found that the lugs on the Arken mounts are too wide to fit the slots on the Weaver rail. I searched for a Pic rail for the same rifle and can not find one I think will work. I looked a couple other rifles to mount the scope on but all with the same result. Have you guys thought about options to make your rings more universal?
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I paid $100 for the Hilo Ti titanium Arken rings and $58 for the pic rail. Put the rail on then discover the Arken rings have key/lug that is too wide for the key way on the pic rail
Picatinny and Weaver are not the same. Some rings are designed to work with both, but STANAG compliant picatinny rings are not. https://www.pewpewtactical.com/weaver-vs-picatinny-rails/
Best solution as others have suggested to remove excess material from the Weaver side making sure that the rear surface on the rail s not modified.
I just received my rings and was disappointed to see this issue with the Lugs. Filing down the lug does note sound conducive to building a precision rifle. These should have removable/swappable lug keys. Please address this issue and add a note to the product description.
Make sure you remove the material from the rear as you should always tighten the base to the front. The best solution is still a proper spec pic rail. This will give a lot more gripping surface area and make a much stronger connection. STANAG compliance was one of the selling points to me for getting Arken rings.
I modified the Weavers on my Savage Rimfire rifle. You just need to slightly open up the slots. An easy task with a Dremel and file. No problem.
I had a problem once, needed to mount Pic rings (Burris) on a Weaver rail (special for Springfield 1903). Sounds similar to your situation.
It was a little tedious but I filed the lugs down til they would fit. This is OK to do since only one side of the lug needs to precisely mate to the slot in the rail. This is what happens, for example, when using Weaver rings in a Pic rail. I would file one side of each lug only, mount the unaltered side of the lug toward the muzzle, and slide toward the muzzle. That way the recoil tends to mate the unaltered, precision side to the rail slots. The filed side is in empty space, does no harm.
If memory serves, it was also necessary to shorten the lugs so they wouldn't bottom in the Weaver slots before the flat surfaces mated.