Anyone who say the G&G blowback only moves a quarter inch doesn't know how it works.
http://www.redwolfairsoft.com/redwol...l?reviewID=201
YouTube - Top Tech M16 R4 Shootting test
G&G blowback (to be correct, faux bolt cycle) only works properly when there are BBs loaded. The fake travel is comparable to systems that use a direct linkage to the piston, but without the issue of the faux bolt unable to return to battery when the piston itself is partially drawn back.