Remington® UMC Handgun Ammo 100 Round Value Packs
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TMJ (some pistol ammo) is Total Metal Jacket, IOW there is no exposed lead anywhere on the bullet.
UMC stands for Union Metallic Cartridge Co, and they are owned by Remington
If you clean your firearm after every use, or on a regular basis with a product like Rem Oil, Hoppes and etc, you'll be fine
Since the Glock polymer striker plate pistol design has hit the market they have become very popular. They are durable and easisly repaired.