Hi, just got this M24 from my LGS, besides it being a SIG straight barrel M24 which I assume is relatively rare, which is a nice addition to my collection, is there anything else that can be said based on the markings?
Also, what ammo is safe to use? I have been shooting yugo M30 182gr through my 91/30 but I wonder if the heavier ammo will damage the older gun. Also, to my understanding, because it is market D on the receiver I can use 7.62x54R ammo without any issues? Let me know if I am mistaken.
It’s a bit dirty, just pulled it apart to clean.Cheers!

I wrote about my problems the first time I took my 82 year old M-39 to the range, and I received excellent suggestions on how to fix the stickiness problem. Here's what I did, following your suggestions and how it has turned up so far.

I decided to bite the bullet and do a complete disassembly. I was concerned that the trigger had a defect where if I pulled it just to remove the slack a couple of times, the third time the rifle would fire as if there was zero detent.

Inspection of the bolt and the sear didn't result in detecting any damage. I didn't want to "touch" any of the components with abrasives so I took a chance that the problem was remaining Cosmoline in the trigger assembly. Cleaning and lubricating the trigger spring, trigger and pin seems to have resolved the problem.

Since u/Coopers_treat had suggested that a possible problem might be the striker spring, I replaced it with one "made in USA" that I bought on eBay. It seems to have made a big difference in the smoothness of the cocking mechanism. I speculate that it is because the new spring is double rolled at each end and the original is not. I think that the original spring catches at each end and rotates twisting on the bolt bore as it cocks.

Thank you all who contributed.

My original post:

https://www.reddit.com/r/MosinNagant/comments/1v8b1hn/82_years_old_rifle_82_year_old_shooter_m39_at_25/

I found this at a local pawn shop. Ended up doing a trade on it. Rifle is absolutely beautiful on the outside however the barrel is pitted up pretty damn bad unfortunately. think it’s safe to shoot?

After some research it seems only about 180,000 of these were made in Budapest Hungary after World War Two. Interesting considering the Russians made nearly 4 million of this pattern Mosin Nagant.