No worries; I see you've deleted the first thread already, so we can disregard it.
Anyways, onto business:
*The sprite work is fairly good, especially since it sounds like it's based off a model rip. However, the sprites are in 32-bit PNG mode, and have semi-transparent pixels around the edges; the sprites should be in 256-color paletted PNG instead. You don't have to use the palette from any specific game; you can use a custom palette if you wish. They just have to be paletted, and without semi-transparency.
*If you can get a version with Doom gloved hands onto the sprite, even better! That will make the weapon more useful to more people. We've got a few "generic-handed" weapons on the Repo, but gloved hands tend to be strongly preferred.
*I see the attack pattern is very similar to the Rifle on the Doom Style Repo, in that it fires multiple bullets at once to allow damage pass-through upon overkill. This is OK (although I prefer to use a customized railgun attack for the pass-through effect), but it has the same general problem in that it's somewhat overpowered. It's even capable of gibbing Zombiemen and other weak enemies. Damage values can be tweaked by the end-user, but for now, at the very least, I'd suggest adding "+NOEXTREMEDEATH" to the bullet puff so that it can't completely blow apart lower-level monsters.
*Speaking of the Rifle, this uses the same pickup as the Rifle. I think this is passable, but I'd prefer to see a more accurate representation of the Mosin-Nagant as the pickup.
EDIT: I couldn't help myself, so I whipped up this pickup sprite in case you like it. It's not perfect, but it's not bad for maybe 20 minutes' work.
You're under no obligation to use it if you don't care for it.
*Also, the submission borrows the RifleAmmo items from the Rifle, but it is missing the appropriate sprite for the small pickup ("RIFAA0"). You'll need to add this sprite in or else the small ammo item won't appear properly.
*Also, the ammo sprite you DO include is located outside the SS_START and SS_END markers, so it won't properly appear in-game when the ammo items are dropped. You'll need to put the ammo items between SS_START and SS_END so they appear in-game. The inventory sprite should also be between the the SS_START and SS_END markers, for the sake of good practice (though it appears the HUD will find the sprite even if it's outside the markers).