I have two Mosin Nagant 91/30's one I kept stock with the exception of scoping it due to failing eye sight and the other a "Modernized" version, Poly Monte Carlo stock, bi-pod, modern scope, limb saver brand recoil pad and the subject of this tale of the jumping scope.
The original (1940Tula) was scoped by me about a year ago and I have probably put 500 rounds through her with no issues regarding the scope, I used the type of scope base that utilizes the "rear pins contact" point of the old ladder style sight base, old weapon, new scope, no issues.
Now the modernized one is an older hex receiver ( Izzy 1929 version) and the ladder sight base on this one was more narrow than the (1940 Tula) so I could not utilize the same scope mounting tech as I did with the Tula so I had to remove the entire soldered on ladder sight base which uncovered the dove tail sight mount under it (what a pain in the butt removing that one as it was soldered on pretty damned well).
I scoped the Izzy using the dove tail base and tightened the rings base screws down on the weapon to the point I thought I'd snap the dove tail mounting screws clean off, I also used the red locktite thread locker on the screws, I ran about 30 rounds through her at one range day until the scope jumped off the base which shocked me.
I remounted the scope pushing the limits of the base screws to the point of near failure, put about another 50 rounds through it and again the scope pops up and I catch it before it hits the ground, I replaced the scope rings and added even more red locktight, passed about 40 rounds through her and this time the scope ended up falling onto the range table.
I got her home and began to inspect the dove tail since the scope rings were changed out I figured it had to be something else, at first I couldn't see anything amiss until I examined the dove tail under magnification and this is what I discovered....
During the process of heating the ladder sight base off the welded on dove tail I had heated the base enough to tap and slide the ladder base off but not enough continued heating to allow all of the solder to run out of the tiny contact line where the barrel and the dove tail meet, I didn't see this as it was clean and uniformed after the removal of the sight base but it appears to be enough that I couldn't get the scope ring base to "bite" onto the dove tail enough to properly secure the rings to the dove tail base.
I remounted the scope again and will head to the range tomorrow to see if the scope will now remain on the weapon now that I have used a dremel and cut off wheel to clean the contact surface line of any remaining solder, if that doesn't work I have no idea where to go from there other than the possibility of mounting a Russian era PU or PE scope which I prefer not to invest $300-$400 for a scope on a $200 old battle weapon.
So I guess this is a cautionary tale of trying to kit bash an old relic with new technology !
I do pray and hope that I have discovered the cause of my break dancing scope troubles.
Has anyone here had to deal with two different ladder style sight base sizes between an earlier and later version of the Mosin Nagant's ??? and if so what was your cure for the difference in base widths ?
You know I do not think they are "rim fire rings" as they came with the scope that was sold for a Mosin Nagant kit, so I am guessing they are center fire rings...No?
No. Centerfire rings lock in with cross pins. Rimfire top-off rings don't. All these cheap scout setups do is throw an inexpensive pistol scope into rimfire topoff rings and have you knock off the rear sight base to expose the 3/8" dovetail underneath.
You really need to do something along the lines of a Brass Stacker scope mount if you insist on using a 'scope, or a Smith-Sights Adjustable Front Sight ( ) with the stock rear if you are OK with irons.
If you decide to go with the iron sights, let me know. I'll send you a leaf/slider/pin/spring for that base (you do still have it, right?) Should look like this, complete:
Hi Josh, the ladder style "base" on my Hex receiver Izzy 1929 is narrower than my Round receiver Tula 1940, I still have the 1929 base I removed from the Izzy and have a complete rear sight for the 1940 Tula but the Izzy is more narrow than the Tula, don't know why this is, I could have used the "ladder" off the 1940 Tula but it is too wide to fit on the 1929 Izzy base.
Most M91 rifles were turned into M91/30 rifles in the modernization program, and if you do indeed have an M91, I'd leave it be as it's more valuable.
I've tried the peep sights that replace the rear sights, but man, they're too far forward. I made, for a time, a Rigby-style cocking piece sight, but it took too much to stabilize the cocking piece for repeatability, though it did work well after getting the stabilization system going perfected and tuned in.
I've found that deepening the u-notch on the rear sight with a 2mm round diamond file has an excellent effect.
Hey Jess,heres the web site for my local guy!He has Everything Mosin Nagant!!Family Owned and Operated.Stoped by yesterday and told him I was moving and the wife ended up buying a New 9mm!Shes as Bad as I am..LOL.Anyway he has All you need to get your 91/30 Right again and his $$$$ are Good!
7.62x54r the scope ripping round lol...try silver solder, brazing it might require too much heat howveer if you can get away with a braze the strength if 1000x stronger... If you don't mind me asking why the sporterization?