AirMaks Arms Anything better for the price than an Airmaks Katran SC for a backpack gun?

My Caiman X gets about 50 shots at 38 fpe using 21 grain H&N slugs. I use an additional moderator for shooting in my yard but I don't think you would loose your hearing to just use the built in. I think the short one would be louder. It has a modular moderator built in and you are supposed to be able to add modules but I've never found them for sale. My X is a 22. Even if the short one was 100 fps slower it would be fine for small game. My guess is the short one in 25 would give you over 40 fpe but would struggle to get over 50. The interior passages are bigger than my P35s but the barrel is shorter and I think it holds less air.
 
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Any photos of your set up?
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6 position adjustable stock with an adjustable cheeck rest. 12" barrel with functional shroud including an internal airstripper. All internal parts are custom. Can go shorter if needed. Only a 200 bar fill vs 300 with the Katran. Plus this gets more shots per fill even with half the air.
 
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