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The seal update is good for this rifle. Donny FL Suppression is helpful. The SLA 550 grain has very good energy, a very powerful heavy round for the Hammer.

What if you have a friend that has a Umarex Hammer to test. Using the 550 grain pellet has maximum energy. Should be able to do 100 yards, not sure I haven’t tried.

Hi, if you contact Umarex in Fort Smith, AR and send it to them they can update the seal/o-ring so it won’t leak again.