Instead of the locking lugs and recesses milled into the barrel and slide of other Browning-type weapons as the Colt M1911A1, Browning Hi-Power and CZ 75, the P220 variants (and many other modern pistols) lock the barrel and slide together using an enlarged breech section on the barrel locking into the ejection port.
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It uses the Browning linkless cam short recoil action of self-loading with a double-action/single-action (DA/SA) trigger mechanism.
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