The G&G SIG 550 is a great airsoft rifle. Built solid. Shoots great.
Real Steel SIG 550s do not take M4 mags. Neither does the airsoft.
I prefer the TM low cap mags for looks and performance, and no modding needed. (MAG brand need minor mods)
You can squeeze a 9.6v mini stick in it if you do a little mod with the battery set up
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