You'll want to get inside and have a look to see where they are dragging. On one of mine they all dropped free but for one. Turned out it was a few thou wider than the rest right at the lips and it was lightly binding in the frame just as the mouth was seating into position. A gentle squeeze in the vise put it on a diet that had dropping out nicely.
On the other one set up to use the wider Lever Arms mags the trigger bow was not centered due to either the frame guide machining or the bow itself. It was only a light drag but enough to hold the mags firmly. A bit of work with a file to thin that side of the bow by about the thickness of a sheet of paper and it too was dropping the mags freely.
Inspecting for where it's dragging is just a case of being observant and patient. Examine the mags carefully where they pass the suspect point looking for light scuffs indicative of rubbing.
We're sort of getting ahead of my posting but I did my own extensions by making up small buttons of steel the same diameter as the stock one. Then I ground and filed off the little dome from the stock pin and used a jig to hold the pin and extension button and soft soldered the extension onto the stock pin. I chose a soft but still silver bearing solder for this because I didn't want to overheat the pin and lose the spring temper from the split locking tangs. Both the buttons blued up nicely and the solder line seems to absorb some of the excess colouring created by the blueing of the steel so the joint line is all but invisible.
I've got pictures of this and a bunch of other mods I did but just have not had time to resize them and upload to my photobucket account yet. I should be able to get it posted up by Monday or Tuesday. I'm also considering doing this extention mod for around $10 to $12 return postage included. I've shot around 50 to 80 rounds through both now without anything falling off so I think it's proven well enough....
Mine were extended just over 1/8 inch but it wouldn't be hard to increase that to 3/16. I'd hesitate to increase to more like 1/4 just because a glancing blow would have enough leverage to work with that the extension button may snap the joint a little too easily. There's really not a lot of options for this since any sort of add on can't sit over the existing button and the button is hardened and small so trying to drill and tap would be fussy to the max. And any extension needs to be sized to be the same diameter of the existing pin because the entire present pin needs to be able to slide fully into the frame to ensure a good release.
It's also good to look into the mag well and ensure that the catch is able to fully retract out of the passage for the mag. If the release spring is a touch oversize the spring coils will bind and stop moving before the catch can fully retract and it'll drag on the mag. The fix for that is to gently and carefully grind the end flats of the spring down a few thou. Fussy work but we are talking about adding an amount of travel about the same thickness as a piece of printer paper to fix the issue. And this is only assuming that it IS dragging. Again a check of the mags for scuffs extending up from the catch notch will soon indicate if this is the case or if it is some other cause.
