When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
OtherEverything else not covered in the main topics goes here. Please avoid brand and flame wars. Don't try and up your post count. It won't work in here.
The rifle appears to be a variant of the L-39 Lahti (Finland) that was developed just prior to WW2. It fired a 20mm projectile of around 4 oz. weight at approximately 2600 fps. Weight was over 100 lbs and was ~88" long.