Durable backpack gun.

L2 was my choice

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The leshiy classic is a hell of a rifle. 2 issues come to mind with your requirements. One is power. The power of the leshiy can be cranked up, but it becomes super hold sensitive (closer to a magnum springer than a pcp), and so accuracy will be off. They were designed to shoot pellets, so trying to shoot slugs might be an issue.
Lastly, even though not one of your requirements. They’re single shot. Break the rifle open similar to a break barrel, load the pellets, then shoot. It’s cumbersome, but if you take your time with shot placement, you shouldn’t need a quick follow up. I myself am a terrible shot, so magazine rifles are needed in my case. I sold my classic to buy a leshiy 2. Still wish I had kept that classic though. Now they’re discontinued, so you’ll only be able to find used or new old stock.
Wish I would have kept my classic too, couldn’t ask for a better back pack rifle

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Leshiy 1 is pretty much perfect to fit in small spaces, though low on shot count. An EvoL mini is not to far off when it comes to size, though it will not basically fold in half. Its still very compact with its collapsible stock, and could be changed out with a folding one. Also the EvoL mine handles slugs very well. Shot count is far better then a Leshiy 1.
 
Leshiy 1 is pretty much perfect to fit in small spaces, though low on shot count. An EvoL mini is not to far off when it comes to size, though it will not basically fold in half. Its still very compact with its collapsible stock, and could be changed out with a folding one. Also the EvoL mine handles slugs very well. Shot count is far better then a Leshiy 1.
What’s your shot string with what slugs out of your Evol?
 
what kind of sights do you have on yours? what kind of ranges are you shooting at?
I have a bugbuster on it now but I. Going to try and make iron sights for a talon work on it. It would just make the gun more durable that way. I shoot up to 45 yrds. Havent really had a chance or need to go further yet.