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I ordered an "extended" (HK45c) mag release for my USP .40 from HKParts, description said for all USP series pistols. I don't have much of a problem with the stock one as my fingers are long enough to manipulate the release with my thumb and trigger finger without changing my grip, but bigger is better right? My Part came in, I had also ordered a new spring and roll pin for it, I figured change one part, change them all right? First trip to range yesterday to try it out (keep in mind I loaded 18 Jet Funnel magazines to shoot, even with a maglula this takes awhile). Load mag, pull trigger, gun goes bang, magazine is on the floor. Get range master to retrieve my mag, I figured I didn't have the mag fully seated. Re-insert magazine, check, try to pull mag out manually- it is locked in place. Pull trigger, gun goes bang, mag on floor again. Unless I cup and saucered the mag would come out every time I fired. Checked with armorer at the range he said either a bad/weak spring (even if it was brand new) or that release is no good for the jet funnel mags. Has anyone here had a similar experience like this???