My friend has an Echo 1 revolver launcher that has been sitting in his display case for the past 6-7 years. I've gone in there multiple times over the years, given it a spin and to my surprise, after all those years of the springs being under tension, I can still get at least 8-9 trigger pulls with rotation.
And for grenades, I picked up 6 King Arms 120 rders. They take both co2 and propane. Gorgeous grenades and perform amazingly. They give off a nice pop when fired and keep their charge for a very long time. And they are very reasonably priced.
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