Ive been an end user of the Mosin Nagant in its various guises for about 19 years now. I have never once read or heard of there being an issue with the bolt firing outta battery, ever.
So with my Faith in He who is Sergi Mosin, Bless his Soul, I can say I "Been there, done that, Yeeeeeeeeeeeeee Hawwwwwwwwwwww and my ears are ringing~~LOL!!~~!!!".
Why not, anyway, I blasted mag after mag from the front porch for 4th of July with the trusty SVT-40
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Using an M-44 and an M-39, both with proper firing pin protrusion, I watched the bolt close itsself as the sriker advanced, then I loaded each in turn with Czeck LPS.
Then I held them outside the window and pulled the trigger, same thing, Striker advanced, handle slapped down and the stik went BOOM. Scared some Ducks up from the Tundra ~~LOL!!~~
The M-39 did exactly the same thing, minus the Ducks.....to bad no Caribou in sight...
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We finnished off the rifles mags, with a couple more "handle ups" and the kids came in and shot off the rest of the box...
I think the striker camming the bolt down in order to reach the primer kinda makes it a "No Problemo" becuase it cant get to the primer and therefor Boom if it aint locked....... unless you have excessive Firing Pin protrusion........My bolt head/lugs look normal too, no new shiney spots or spalling/gouging anywhere on either on, so Im fairly sure they were locked up tight.
Excessive firing pin protrusion might rear its ugly head with a periced primer or two, but the big" Nasty" would be pulling that trigger with teh bolt handle lifted just 'enough' to blow that bolt over you hand(Ouch!!!) and into your face real sudden like(Ughhhhhhh!!).
I dount the bolt retaining stud is gonna stop it, speccially if the cartridge was chamber'd.
Now HOW could that happen?
Hmmmmmmmm......, which might just why the Mosin is the ONLY rifle I know of that actually has a firing pin protruion gauage Issed to each soldier that gets a Mosin (was Zitesev issued a tool with those bullets, or did he even get one in the Wishing Well in that movie?)......on top of having each firing pin fitted and struck to each striker.
So dont go messing with your firing pin protrusion, unless you have your issue protrusion gauge/screwdriver/bayonet removal wrench tool in easy reach~~LOL!!~~
I think the Russians issed a simple accurate soldier proof rifle, and having the bolt locked down solid is a good thin for sure, just like that fool proof safety, and wood handguards that keep hands from burning or freezing to the metal.
A well thought out design for the 1890's, 50 years before WWII.......and to think, the Finns only made them better.