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Umarex Glock 17 Gen 4 pellet or Gen 5 pellet

any other advice?
It uses a belt type magazine, so be sure to use good quality wadcutter pellets. 7 grain RWS Hobby pellets work well. Also get a tube of Crosman Pellgun Oil. Put a drop on the tip of the C02 cartridge neck when you load a fresh cartridge in the magazine. Keeps your seals in good shape and lubes up the internals. Also, if you buy a spare magazine, you can let one warm back up while shooting the other. You'll get more shots per cartridge that way. There's a break-in period. Takes around 200 shots and things will smooth up and run well.