Welcome to the forum.

Your 'pistol' is actually a revolver since it chambers more than one cartridge at the same time. It has no pressure sleeves (whatever those are, no such thing) in the cylinder chambers.

The serial # 159393 indicates it's officially a ".32 Hand Ejector Model of 1903 - 5th Change", and likely produced ~ 1916.

I believe you mean Magtech ammo which is safe for it as long as it's standard loadings. The cyl is not heat treated so anything other than currently manufactured .32 Long standard pressure ammo is not recommended.

The correct grips are hard rubber Gutta Percha or walnut with gold plated recessed S&W medallions, either should be shaped like the top gun in post # 70 above.

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Jim
S&WCA #819