I read his thread, but I still think he trimmed down too much. His magwell issue and magcatch is related. Prowin asks for 0.2mm I believe on their site, which is minute. If he judges the "trial and error" based on if it goes in freely, then when it does it might have just completely not contacting the nozzle anymore.
My experience is that they fit "tight" to my WOC, probably because it is compressing the seal slightly. But as such it will seat if it was inserted with a bit more force(and no problem at all if the bolt is locked back, and released once inserted).
Now from experience, the loosest fitting mag I've encountered is Bomber(and conincidentally they also turn the lowest FPS of all the mags I have). The new G&P might be the same(since they are apparently Bomber also), but I have not received mine yet....
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