From a "works well enough" point of view...the KWA one does the trick. I haven't looked at the TM one much...but unless it has a built in power regulator I'm not sure how else I'd want to change the KWA MP7....or unless their mags magically work at -10C temps but don't get too hot in 30C weather....LOL
Is it's hopup design that much better...the KWA one is pretty cheesy.
There really isn't a whole lot of recoil associated to the HK MP7 to begin with...it's purpose designed to be low recoil. So not having more than GBB pistol recoil on the MP7 is just fine by me.
It's nice to have options though...
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