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Yes, it's a weaver rail and a poor choice on Hatsan's behalf since it severely limits the choice of rings unless you use the dovetail instead. I actually found a .5" picatinny riser on Amazon that has adjustable spacing between mounting bolts so I was able to install it on my 135's weaver rail allowing me to run picatinny rings/mounts.They work well with the UTG or other brands of dovetail to picatinny adapters. I have a Hatsan that has a non picatinny standard but picatinny looking dovetail / multi slot rail on it and it needed the inserts.
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Curious as well. Just discovered what you did. I sure hope he's still in business. I came here looking for answers.Is he still in business? His website is down, his FB hasn't had any activity in months and ppl say he hasn't been answering his phone.