Hi All, Long time lurker - appreciate all the knowledge here. Actually the 10 'ring push me to get a G29! Yeah! Now - with that said, I've had about 15 failure to feed out of 500 or so rounds in the last two weeks. Wondering if you could help me ID this spring as glock OEM or not - or if all aftermarket springs have some sort of writing on them? This one has no words/measurements on it. Backround: Bought as used gun with no history available - (might never do that again...) and I *think* its a heavier than normal spring - so I'm having issues shooting w/lighter loads. At first I thought it was the magazine (only one came with the gun) but after getting a few other magazines I could duplicate the problem (failure to load) with a slightly "limp" grip and light factory loads (160-180 gr practice loads, pretty much the .40 stuff in a 10mm shell) Winchester Silvertip HP, and Remmington UMC. The heavier (CCI Blazer 200+gr) cycled no matter how much of a pansy hold I put on the gun. I'd like to run the lighter hollowpoints through it for SD when I move and CC, but if it's not reliable I'll stick to my G26. Glock 29 of recent manufacure I believe - first 3 of serial: MKL. Thanks for any info, themiller Also - I know springs are cheap, and I can't tell if this one is "worn" or not - maybe you can?