There are a lot of possibilities here. Does the other barrel fire if you set the trigger for the other barrel? If so, you may be holding the shotgun too loose, away from your shoulder, or have too much padding on. The Baikal in ejector mode has to, upon firing, trip the ejector sear. If you hold the firearm too loosely, the ejector sear will not trip and the next barrel will not fire.
Two. One from the firing squad who had a conscience shot and the second from the follow up.
The Baikal is chambered in .223, .308, .30-06, and .222
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
£475 English pounds from York Guns
The firing squad is a form of Death Penalty, so people were shot by the firing squad for committing crimes for which death was the sentence.
/
Well yes, I would
75-225 USD
/
/
/
About $100 to $200