Nico Joule Airsoft goes over the various details of the SIG Air ProForce M17 GBB. The Sig Sauer ProForce  M17 is a high-end airsoft gun that mimics the M17, a real firearm. Sig Sauer makes both models and ensures they are identical in size and appearance. The ProForce division also produces the well-known SIG MCX AEG carbine.