Quoted: Can somebody briefly tell me what the differences between a series 1 and 2 are? And why the 1 is better?
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Series I guns have no firing pin safety. Series II guns have a firing pin safety tied to the grip safety. This is a design originally developed for Colt prior to WWII, which they shipped some experimental guns. Colt eventually went with a firing pin safety tied to the trigger, called the series 80.
The problem with the colt series 80 is that it affects the trigger pull, since the action of the trigger is moving the firing pin block out of the way so the gun can fire.
The problem with the Kimber series II is that it was reported that it was causing failures to return to battery when Kimber changed over. Also, if you are depressing the grip safety when removing the slide, you can have problems with disassembly.
The problem with having no firing pin block is that the gun can fire if dropped on the muzzle with a round in the chamber, from the inertia of the firing pin. Having a titanium firing pin will reduce the chance of this.
My own opinion is I don't really care. I've shot all three types and they all can have a good trigger pull, and I believe that any reliability problems have been fixed by now.
The general consensus seems to be that the firing pin safety on a 1911 is a lawyer invented feature, and isn't necessary.
My own opinion is that I did personally drop (on accident) a springfield .45 with no firing pin block from a height of about four feet. The round in the chamber did not fire, but had a LARGE dimple in the primer. It is my opinion that if the height had been greater, the gun may have fired. It is also my opinion that if I had a proper holster at the time, I never would have dropped the gun. My brother in law dropped a springfield compact and the gun DID fire. I don't know specifics because he was very embaressed by the incident and I believe he wasn't entirely truthful when relating the story.
Personally, I prefer the firing pin block, either kimber or colt. My own personal choice of 1911 to carry is a Colt Delta Elite 10mm which DOES have the series 80 block. My nightstand gun is a colt 1952 commercial 1911 which does not. Both are left cocked and locked.