On pistols with oversized slides the bushing didn't grip well enough, and accuracy suffered.
The new 'collet' bushing (as it came to be known) worked quite well, however it was prone to breakage if the inside diameter of the slide was too small as it caused the fingers to buckle, then later break from the stress of being wedged between the barrel and slide. It should be noted that the shorter 4 1/4' barreled Commander pistols retained the use of the older solid bushing design and thus were never designated Series 70 pistols, although one hears the term erroneously applied to Commanders from time to time. Models using the new barrel/bushing setup were the Government Model and Gold Cup, which were designated the 'Mark IV Series 70' or simply Series 70 pistols. In this system the bushing utilized four spring-steel 'fingers' that gripped the enlarged diameter of the muzzle end of the barrel as the gun returned to battery.īy tightening the fit of barrel and bushing in this manner Colt was able to improve the accuracy of the average production gun, without going through the expense of hand fitting the older solid barrel bushing to the barrel and slide. The Colt Series 70 guns were introduced in 1971.Ĭolt introduced the first major design change to the Government Model in nearly 50 years and in an attempt to improve the accuracy of production guns the barrel bushing was redesigned, along with the barrel.
Maybe the first thing one should demand of his sidearm is that it be unfair.” - Guns & Ammo, January 2002 Let's do a history lesson. WOW, how did I miss this? Jeff Cooper “The 1911 pistol remains the service pistol of choice in the eyes of those who understand the problem.īack when we audited the FBI academy in 1947, I was told that I ought not to use my pistol in their training program because it was not fair.
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