www.systema-ptw.com Go to the forums. Read read and read some more. Every bit of information you ever need will be on there and chances are if the question has been though of its been asked over there.
all personal preference. I recommend m4 length. if you want a light gun go with aluminum barrel. Steel is noticeably heavier. stay clear of 08's. challenge kits seem to have more problems, and I recommend buying whichever gun you want used. they are alot cheaper used.
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