on the ICS, the whole upper mechbox comes out, whereas the Systema PTW's, just the cylinder comes out, and it much more compact then carrying an extra upper mechbox around with you. Imagine being able to carry all 3 cylinders on you, and being able to change the range of your gun in seconds, even during a fire fight. why buy 3-4 TM's when you can buy 1 PTW and have 3 guns in one? And an extremely sweet one at that.
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