There are many mounts on the market these days for the Mosin nagant rifle.
I desided to look at some of these options and try and find the best ot there.
Something that would hold zero and not be a pain in the butt to mount on the gun.
First we will start with the ATI scope mount for the mosin nagant. This is probably one of the more affordable mounts out there and can be found at most sporting goods stores.
For starters this has to be mounted via drilling your reciever. If you want to keep your gun original. This is probably one of the worst options on the martek for you. It is only held on by 2 very shotty screws. And only 2 front screws. I have heard good things about this mount. But you have to be a gun smith to install it or line it up just right. Make sure you have a drill press handy as a hand drill may not cut the mustard. Bonus tho it comes with drill bit and tap also a bent bolt handle. But alas it is a screw on bent bolt handle. Another ask a gun smith part of this install.
Moving on to the UTG tri-rail mount for the mosin nagant rifle.
I have heard mixed reviews on this lil puppy. Some say it holds zero well, some say it's crap and moves all over the place. I think some of that is just user error.
This mount replaces the rear sight leaf and uses the leaf to hold it steady and get rid of some of the slop (side to side movement. This probably comes in as the cheapest mount out there ranging from $30 to $40. And a no gunsmith install. Good if you want to keep your rifle in its stock form.
The B-square mosin nagant scout mount. Another one of the $30+ mounts out there. I've heard mixed reviews on this one too. But I'm a believer you get what you pay for. But then again some people have good things to say about it.
This is another good way to not alter the rifle in any way and give you a way to mount an optic.
Now..You can go the O.G. route and get a PU/PE type scope mount. But if you can find one of these they are gonna cost ya. Anywhere from $100+ to $200+ depending where and when you can find one.
This scope mount needs modification to the receiver as well as the stock! They are held on by two screws in the side of the receiver. Another gun smith special to get this guy mounted correctly. Not for the faint of heart. But in the End you get an original sniper mount used by the Ruskies. Good for that guy who has to have everything milspec.
Moving on. The rock solid industries mount. Costing around $100 (plus shipping) It is said to be one of the better mounts on the market. But mounts much like the ATI mount. Also requires you have a bent bolt to work. Oh, conveniently RSI sell a bent bolt. So it's a one stop shop.
Again this is a gunsmith type install. Not for the novice. Unless you got the tools and the know how.
Jmeck scope mounts seem to have a good reputation for staying on and holding zero. These mounts are going for around $100 give or take. The install seems pretty straight forward. No drilling or even sight removal. Only thing that needs modification is internat stock modification to fit the band. If you are looking to keep your stock in it's original form for collection value. This isn't for you. Aside from that it is an internal modification and is hiden from sight.
From user reviews. This mount seems to hold up nicely. Holding zero unless you drop the gun on the mount.
The standard Jmeck mount requires you to have a bent bolt. Which is some extra money. But they also have a z type mount so you can keep your straight bolt. For an extra $20 or so it's worth the Z plate.
So, in short. There are many others out there on the market. These are just some of the popular ones I found. Or the ones that are easy to find. If you have any other mounts for suggestion please post them so others can check them out. I am not a rep for any of these mount companies or do not have direct exp. with many of them. This is just to let people know what kind of options are out there. All images were taken from the interwebnetz and none are mine.