After initial assembly, there are two main reason why the slide won't go back more than ¼" out of battery: Link's too long; too much metal on the on the barrel lower lugs holding the barrel up too high.
• See if the link is the problem by removing it, assembling the gun minus the recoil spring, cocking the hammer, pulling the slide back slowly with the gun right side up and look/feel for any hesitation of the slide to come all the way back.
• Assuming the slide still hesitates to come freely out of battery means the link is not the problem and that metal needs to be removed from the barrels lower lugs.
• Get an idea for how much metal needs to be removed by using numbered drills or pin gauges as sequentially smaller substitutes for the slide stop cross pin until the barrel goes in and out of battery without hesitation. The difference in measured diameters between the cross pin and drill/pin gauge is about how much must be removed.
Q: About how much metal needs to be removed?
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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