Depends on the gun - the WE is under $100 and from what I hear pretty good imitation - the Tokyo Mauri model is pretty close to an airsoft that is the real thing. That is $175 with mags about 35 or so. My wife got me this for Christmas to practice for summer USPSA - they also have a whole line of targets that are close to the ones in competition. I have been told that in Japan this is the only way that they can practice due to their gun laws - then then come here and get to use the real thing. I put better sights on mine, like on my real gun and it works pretty good - weight is I think within a couple of oz of the actual gun - and while not as good as my 5.25 is fun and good practice on target and sight skills.
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9 MM XDSC, 9 mm XDM, 9 MM Tactical, XD Service 40, XDM 40, XDM 40 Limited Canyon Creek, Canyon Creek 4P 5.25 9mm, XD-S 45, CZ 85B