KWA - KM4 SR7

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Hello all, looking at getting the KWA - KM4 SR7 as my primary CQB rifle, the internals are pretty much perfect for what i plan on doing with it, and i only plan on modifying the externals at the moment.

Any of you had experience or can give me a little insight before i confirm the purchase?

Also anyone no any UK based retailers with this gun for sale? (comparing prices can never be a bad thing)

Thanks, Jake.