For the people saying they don't want to buy it because of this "problem." I'll let you in on something my DDMK18 has the same "problem", when I'm shooting outdoor range and good breeze comes in, I get gas and unburned residue flying towards my face. Nature of the rifle, take it with a grain of salt. My DDM4V2 with a 14.5" barrel M4 Profile did the same thing. My friend who owns the Tavor also owns a DDM4V5 with a 16" barrel, same "problem." The common denominator was ammo, all Norinco 5.56 from 1995 I believe was stamped on the box. With American Eagle or Remington or Winchester or Hornady, minimal to no blow back. I bet you if you bought a $600 Norc or $3K Tavor or $3500 KAC rifle, you'll get some kind of blowback minimal compared to the Tavor's interchangeable problem, but it will still exist.