You can probably reuse the same shroud, as the military safety is much more positive and does not require a notch. This will give you a positive safety, something that is not likely to break. My advice, especially on the 1891 Argentine, is to re-install an issue military safety if you do not intend to mount a scope on the rifle. Later versions have a small rubber 'O' ring to assist in retention, but I never saw one that couldn't just be pulled out to the rear when in the fire position. When the safety is in the 'off' or 'fire' position with the wing up it is not held in by anything except the friction of the safety's shaft inside the shroud. Looking at your photo it appears to me that perhaps your notch has broken off, not uncommon in these rifles, as there isn't much of a surface in which to grind the notch, and the result is a pretty thin rear wall of the notch which is not only prone to breakage, but which situation is perhaps enhanced by the heat of the actual grinding effecting the temper of the metal. When installing them you must cut/grind a notch near the rear of the bolt shroud to retain the safety in the shroud when it is in the off/safe position. I've installed several of them, and have a couple of my own rifles equipped with them. The Mk !! safety is sort of a problematic device. I'm just trying to get as much info as I can for when I talk to him. I am going to take the gun to a gunsmith. But the safety doesn't stay in when cycling the bolt except for when the safety is all the way to the right. Since I am just replacing the firing pin and the cocking piece, I would think any adjustments would already be done unless they are to be done to the cocking piece. Is it called something different in the diagram? TexasByGod, could you post a pic or two of your gun so I can see what you are talking about please? I don't see a piece labeled a bolt shroud in the parts list diagram in the link. I have found my safety, It is a Dayton Traister - Mark II Safety as in the link below: My wife inherited this gun from from her father who got it from her grandfather. I don't think the bolt had ever been taken apart and cleaned.

There was enough crud built up that it was almost a 1/16 of an inch thick on one side. they are nice and shiny.Д¤05grain, the stuff you were concerned with in the bolt sleeve was all crud and its all gone.

I received my firing pin and my cocking piece.

1891 argentine mauser firing pin