How do they compare in the following areas: - recoil - flip - noise - muzzle flash I would think GAP would be more recoil, flip, and noise, in comparable guns, since it operates at higher pressure. About the only real difference is you can get a smaller grip. Is there any other real advantage to GAP? I've only shot a few .45 ACPs (G30/G36, some old 1911) and the flash from the Glocks was substantial. Was using Blazer aluminum rounds. Are the 3.78" barrels just too short? How long would the barrel have to be to eliminate the flash (or reduce it substantially)?