So I found a previous owned Glock 30SF the other day and it had a used tag on it but look like it had never been fired, every part that normally wears on a Glock that normally shows wear after a couple mags looked liked it had never been touched. With the price and condition I bought it on the spot, awesome right a brand new Glock with a used priced tag, well not entirely. I got home and noticed some built up debris between the extractor and extractor rod and then I check the firing pin by pushing down the safety plunger and the firing pin would not drop down so I manually pressed the firing pin down and guess what the the firing pin did come when pushed but so did a gob of grease on the tip o the firing pin, you see where this is going right? I opened up the slide pulled out the firing pin and extractor rod then the extractor and safety plunger (or whatever its called), every single part was coated with lime green grease. The grease was on and in everything and thick very thick, in the firing pin channel, behind the extractor, in the extractor channel, in the springs, on the firing pin, in the plunger. I was pretty shocked to say the least. Anyways two hours later lots of q-tips, alcohol and plastic safe degreaser and it was as good as new but WHY would anyone who knows how to open up the slide and get to all the internal parts put a crap load or grease in there? Sure I knows it not very hard to dissasemble a Glock slide but it is a small process and I would think anyone who knows those steps would be smart enough to know not to put anything in those areas especially a whole bucket of grease. You know it just seemed kind of fishy to me, I went to the place I bought it the next day and asked if someone had a grudge against them or Glock, I was sort of kidding but mostly not. I put 300 rounds through it with no problems it shoots great. I made the mistake of trying to use some reloads that same place sells to use in their range and they where so weak it barely ejected the brass, I immediately switched to factory ammo and all was well. I did think maybe this previous owner bought those same reloads for his new 30 and went into their range and experienced those same crappy ejections and thought something was wrong so he went home and thought some grease would fix it. idk Sorry for the long post but their was no other way to put it, your thoughts would be good and I also was interested to hear if you have experienced anything crazy with a used gun.