i got my prowin for around $480, and could have gotten it cheaper through the right channels.
swapping out springs is too easy, one bolt and thats it.
much cheaper to have a set of different springs then to buy a set of different systema cylenders.
but i will admit one thing about the systema PTWs, thier gear setup is just awsome. you have one inside the other, so it takes up less room in the lower reciver.
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Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.
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