The Colt "Gold Cup" pistol, in .38
Special, introduced on the commercial market in 1960, was an alternative to the .38 AMU
model. Technically, it functions quite differently, as it was of blow-back type. The
barrel therefore did not bear any locking rib. However, upon firing, the barrel had the
possibility to move back on a very short distance with the slide, in a rather same
way as the "floating chamber" of the "Service Model Ace". The barrel
being drawn back by friction of the cartridge case. To get more information, refer to our book .