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I am going to guess its the disconnector issue. Which would make sense with a new stirrup. Its the part that sits on the right side of the frame that the top part rides on the bottom of the BBU. Take the slide off and take a look at it, it should poke out on the right side. When you press the trigger it should stay up. But if you imagine the slide being there, the groove on the BBU will push it down as it cycles, but when the slide return fully to battery, it should be up again. So if you press the trigge with the slide off, manually cock the hammer again, and press the disconnector and see if it springs up freely. If not then that is your problem.
The disconnector typically gets hang up under the sear, you can chamfer the underside of the sear(the edge thats towards the front of the gun), and also you can bend the right most leaf spring prong inward(again, towards the front), which will put more tension on the disconnector to push it up. This will make the trigger pull slightly heavier, but for me it makes the disconnector works more reliably.
Someone else asked this, I figure I cut and paste to see if this helps you...
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