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I have a 1st year 38 Diamondback I just picked up. Shoots great in single action. In DA, I get on average 2 mis-fires per cylinder. Tried several types of ammo. The cylinder measures 1.552" to 1.555" (if I recall). Is that .003" enough to cause it to misfire or is there something else??? Why won't it do it in SA mode??? I may just send it back to Colt's, I've had good success in the past with them. Just hate to send in if it is an easy field service thing...

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There are a number of reasons for this, but the "usual" is someone bent or altered the mainspring in an attempt to get a lighter DA trigger pull.

The gun usually fires SA because of the longer hammer fall.

While it could be as simple a fix as a new mainspring, if it IS something else, you've wasted time and money.
 
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