The A&K ACR has a heavy metal upper (not super heavy), so if you go that route then I guess the PTS version to save a little weight, but ACRs aren't little by any means, as mentioned above.
M4 CQB is always a safe route, it's very customizable with tons of upgrade parts and everything available everywhere and good pricing.
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I have developed a new sport called Airhard. Pretty much the same as Airsoft, except you have to maintain an erection...
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