First of all I can tell that in general all the Mosins which don't match or force matched can be anything.If the barrel doesn't match the receiver it means that you can not be sure that if the sniper receiver comes with sniper barrel and opposite.In my case the receiver was without holes but almost all of the parts were mismatched so the barrel appears to be 1943 Izhevsk and the receiver was 1941 Izhevsk.The funny thing is that the bolt handle appeared to be bent back so it was initially the bent sniper handle which later was heated and bent back for some idiotic reason..
A secondly I assure you that the real sniper barrels were always machined on different benches and were totally different in terms of accuracy where they were unbelievably good because they were made in extremely precisionous way and finished with many more stages than the regular ones.And also their exterior was slightly different so they really didn't fit Mosin bayonets at all because they were too thin at the muzzle end.But the disadvantage of that scheme was that every sniper Mosin has a stronger kick but sniper actually doesn't care..And the extractor groove was also unlike on any other modification because sniper Mosins had all their parts very close to each other and almost without lufts.
As number three I remember that in fact there were much more scopes and mounts made then the rifles themselves in order to send them to the frontlines and so to increase their effectiveness and also for this reason when Kochetov invented his scope mount for PU-Mosins,all the receivers since then were made with higher edge so that all their receivers were transformable to accept the mount of PU scope's rings if the holes will be drilled.And because of that facts as far as I know there were only 200 to 250 thousands of factory-sniper Mosins made during WW2 and the number of professional soviet snipers which were trained during WW2 was 350 thousands and also more than a million(!!!) Mosins were returned with the scope mounts after the end of the war,and unbelievably but many of them not only had the hand-drilled holes in the receiver but also many of them had the hand-made scopes either!And the quality of the scopes themselves was very high sometimes..Remarkable that they were made sometimes in trenches with factory standard quality!
You may disagree with me but when I met an old guy who was unbelievably qualified self-educated gunsmith and he shown us how he made the Mosin's bolt head in little more than in one hour from the cuted rebar piece with only using a buzzsaw,a drill and a pack of various rasps with which he finished it and we figured out by measuring it with micrometres and all other high precision measuring tools that he mistaken couple of edges only for less than 5 microns WITHOUT MEASURING ANYTHING!He only had another sample before him and in one hour+change he made such an incredible copy!And yes,after that I gave him my receiver which was on that moment already refinished after welding all pittings on it's exterior and he again surprised me like hell because he didn't use any special tools to make the holes with internal screwings just with rasps and also when we screwed down the mount rail for PU scope's rings and checked the accuracy of those holes and so,the scope aiming line with help of laser-round it appeared to be perfect.So don't forget that fact that vast majority of PU-Mosins in fact are made from common ones-and that is not the same!
And what I can tell you about dangerous guns-it is not so much possible because of the fact that one third of the barrel's thickness is only in reserve even on sniper modification thin barrels and so those guns on photos are not dangerous to shoot also because after cleaning their barrels were perfect inside(well,Mauser was a bit crippled only 10 centimetres and closer to the muzzle end but both had completely intact chambers)so I assure you that it is not dangerous to shoot those relics-I shot Mauser which is shown on these photos 8600-8700 times although I didn't do anything with it and left like it was on the latest it's photos among those which you seen ,besides among all the other stuff which I repaired these were the best inside and also not the worst in exterior..And yes,we had enough cases of exploded barrels and other "pleasant" incidents like flying bolts and other stuff like casing explosions,so first of all we became immune to that crap and to be honest the stuff like on photos,but worse we were either shooting with wearing serious protection or even tied them to the tree and firing it with help of a stick from behind the tree itself and so covered by it.So most of times we were safe))
In fact there were several cases which were far more dangerous than exploding rifles in someone's hands,and some even had consequences,but fortunately not lethal..First case that I remember was just because one guy decided to check the chamber of a freshly excavated Mosin in an idiotic way so before opening the bolt(which is a nightmare even in our practice-we all hate most of all unscrewing the barrel from the receiver or extension nut and opening the bolt as well)and so he simply removed the magazine assembly and the sear and started hitting the cocking piece with a hammer-and suddenly it moved and stroke the capsule and surprisingly that faking round went off-we never before had even a single live primer on 7,62×54R because of it's construction specs(strange but 95%of 7,92×57 are intact and so we never replaced their primers while reloading-we knew the tips how to exactly identity that it is good or not,so only 5% were replaced)
and on opposite,after test loading more than half thousand 7,62×54 with shiny almost intact exteriors,which didn't work even just a single of them!But in that case it worked-and luckily the bore was already cleaned,so it didn't explode and the bullet came out as it should...And hit exactly the guy's laptop totally destroying it and making
a hole in the wall so I had to grab the fire extinguisher to stop the beginning fire in the guy's house because the goddemn round was armour piercing-incendiary,as I was after that always kidding him-"the best solution if you want to shoot your Mosin at home-definetely API loads only and only in random directions"������
Also there was the case with my other friend which decided to replace two pins in the handle of his almost intact MG34 with the pins cuted from nails and the sear was also holding by such crep and thanks to that when he fired another round he discovered that the gun runs full auto(In Russia it is possible to have any firearm converted into a semi-auto in any way just by removing parts-so in fact if you remove the auto-fire trigger section of MG34 it is already semi-auto and you are even able to go hunting with it and just have this auto-trigger detail in your pocket-god bless those who made that law)and the guy is unable to stop it-so he hold it's handle until for some reason the flashes started coming from the middle of the gun together with squashed hulls so he cried:"hit the ####ing ground!",ran in the opposite direction and jumped into a garbage pit and so we just stood with another guy like goalkeepers and watched the rebelled machinegun to avoid it pointing at our directions and ripping us apart in such way,but luckily the recoil of MG34 is not so serious in compare with it's weight so it was only enough to change the muzzle direction much less than we supposed it would..But most of the burst of 350 rounds(7 belts united in one,50 rounds each)went in the guy's small barn, almost destroyed it and I again had to grab the fire extinguisher to fight the fire beginning in the remainings of the barn thanks to miscellaneous rounds at the belt some of them were tracers,incendiary and APIs with APTs as well..And as I figured out there was in conclusion one casualty of this mess-poor cat was detected smashed all across the wall��... But the guy didn't face any consequences(except destroyed barn,killed cat and several broken parts in his MG)because thank God his house was situated in the area where we were the only three dudes who were there at that moment because the village is almost empty at winters especially on Monday and also of course that burst went in the nearby forest and didn't damage anything else but the barn..And the remarkable thing is that when that MG cooled down after it's rebellion-we discovered that it stopped firing because it jammed..With only 6 rounds left������In aftermath the guy replaced all the damaged parts and made the gun construction enhancements which allowed it to shoot from the closed bolt only and the sear with it's pin were ordered in such a tough material that seems like they are everlasting in compare with any other parts of this gun..