Your Mosin appears to me to be just about the perfect behind-the-truck-seat rifle for knocking around. Throw a cuff on it with some ammo and it's a great grab-and-go utility carbine. I can appreciate the butt pad.
I had something very much that that in mind years ago. I was trading messages on a Mosin-Nagant board and ran across this person who had bought a Century Arms International U-Fix-Em. These were basket-case Mosin 91-30s, and you were guaranteed a barreled receiver... anything else was gravy. You might get a bolt, you might get a stock (broken or not), you might get a handguard and various hardware, but what you WOULDN'T get is a complete functional rifle. Cost was $20 plus the shipping.
The buyer of this particular U-Fix-Em was unhappy that what came in the mail was a barreled receiver, bolt, broken stock with a piece missing, and nothing else. He was griping about it online and complaining that his $20 had been wasted. With a project like your carbine in mind, Jim, I sent him a message saying that if he was unhappy with his basket-case rifle project I would make him whole on it. I would pay him his $20 back, plus shipping, and take that collection of parts off his hands.
I was eager for it to arrive. I wanted to get started working on it the day the box arrived. But when I opened the box, there was something weird about the barrel... it had a shallow spiral cutter mark on the outside from one end to the other, and a stepped profile, like the factory hadn't bothered to complete the finish on it. I checked the barrel date, and it was "1942."
I imagined Vasily sweating over his lathe trying to get one more barrel in the bin while listening to the bombs dropping outside. (Of course the Nazis never got near Izhevsk, which was the arsenal was that produced this rifle, but never you mind about that.) I took to calling it the "Siege of Leningrad" rifle in my mind. When I imagined me doing a Bubba on this piece of Russian history, well... I found I couldn't do it.
What I did wind up doing was spending about $150 more to buy all the missing Izhevsk Arsenal parts to complete that rifle (handguards, barrel bands, buttplate, etc.), plus I found a solid piece of white ash that I glued onto the buttstock to replace the missing piece, then contoured and finished to match the muddy greasy original wood. I even wound up getting a military-issue sling with dog collars for it, and the matching cleaning kit.
I would eventually sell this rifle to a Mosin collector who appreciated it. He reported back that it was quite a shooter, unexpectedly. So it all worked out well in the end, except I never did get my truck gun.
-AaronB