The 1889’s action was designed to lock the cylinder in place when the trigger was pulled. This allowed for faster loading while leaving the top-strap intact/connected-which became critical as Colt evolved their DA platform to handle higher-pressure cartridges that S&W’s “top-break” guns could not.Ī Trigger-Locking Cylinder. The DA lockwork they designed around this “V-spring” proved far superior to Colt’s earlier DA designs-which consisted of fragile, fiddly mechanisms shoehorned into Single-Action Army frames (basically).Ī Swing-Out Cylinder. With the M1889, Colt began using a distinctive flat-wire mainspring folded into the shape of a V. And while the 1889 platform was still fairly crude at that point, it introduced 3 key innovations that remained constants in Colt’s revolvers for the next 80-some years:Ī V-shaped mainspring.
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