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
4570 ,
Try egunparts
You will need to state the model if you want an answer. Baikal has made several different models
The Baikal IZH 38 is rated at 410-498 FPS.
A few hundred to multiple thousands of USD depending on EXACTLY what you have.
The 45/70 is best kept in the 0-150 yard range out of a lever gun.
The best answer I can give you is to post at http://www.trapdoorcollector.com/
4570 g = 4570000 mg
There are 1000 millimetres in one metre. Therefore, 4570 millimetres is equal to 4570/1000 = 4.57 metres.
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