Some of the very earliest Contenders, those requiring a screwdriver to switch the firing pin between rimfire and centerfire, had smooth sides, without the cougar etched on the sides. All three of these Contender variants have a cougar etched on the sides of the receiver, thereby easily distinguishing them from the later G2 Contender which has a smooth-sided receiver without an etched cougar. centerfire, the second variant has a left-center-right toggle switch for selecting center fire-safe-rimfire firing pins, and the third variant has a horizontal bolt selection for choosing center fire-safe-rimfire firing pin positions. The first variant has a push button selector on the hammer for choosing rimfire vs. Three variants of the original Contender design were later developed, distinguished easily by the hammer design. The initial baseline design of the Contender had no central safe position on the hammer, having only centerfire and rimfire firing pin positions, each being selectable through using a screwdriver. The Contender frame has two firing pins, and a selector on the exposed hammer, to allow the shooter to choose between rimfire or centerfire firing pins, or to select a safety position from which neither firing pin can strike a primer. This allowed easy changes of calibers, sights, and barrel lengths, with only a flat screwdriver being required for this change. A barrel of another caliber or length can be installed and pinned in place, the fore-end replaced, and the pistol is ready to shoot with a different barrel and pre-aligned sights. Since the sights and extractor remain attached to the barrel in the Contender design, the frame itself contains no cartridge-specific features. By removing the fore-end, a large hinge pin is exposed by pushing this hinge pin out, the barrel can be removed. The most unusual feature of the Contender is how the barrel is attached to the frame. 22 Remington Jet, but as Magnum calibers took off in the 1970s, the Contender quickly became very popular with shooting enthusiasts. Originally the chamberings were on the low end of the recoil spectrum such as. Thompson Tool began marketing Center's Contender pistol, the company name was changed to Thompson/Center Arms Company. Although they cost more than some hunting revolvers, the flexibility of being able to shoot multiple calibers by simply changing the barrel and sights and its higher accuracy made it popular with handgun hunters. Thompson Tool Company and they introduced this design as the Thompson-Center Contender in 1967. Warren Center, working in his basement shop in the 1960s, developed a unique, break-action, single-shot pistol.
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