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what type of scope mounts do I need
Any reputable gun dealer should be able to source an extension mount for the Baikal single shot rifle. Millet make mounts suitable for the Baikal rifle
Try egunparts
The Baikal IZH 38 is rated at 410-498 FPS.
You will need to state the model if you want an answer. Baikal has made several different models
One can purchase rifle scope mounts from websites like Optics Planet, Cabelas, Amazon, Scope Mounts, Airgun Depot, eBay, Talley Manufacturing and Jmecks Scope Mounts.
Baikal RIFLES:Here's some information that may help you. Baikal is made in Russia. Their web site is (SEE THE LINK BELOW) the guns are imported through Pyramyd air inc and Compasseco inc. You could try both of them to see if they can locate parts for you.OR: you can search the web for airgun repair and locate someone near you to repair the rifle.
The original IZH94 from EAA/Baikal was 1/12. http://www.predatormastersforums.com/baikal.html One could surmise that the SPR94 is the same.
yes
Contact Marlin
You will have to measure it. Hammer-forged barrels made by Baikal can have quite a bit of variation in the rate of twist. I have a Baikal .243 that was supposed to have 1:10. I measured it, and it is actually 1:8.6!!
Weaver