Well, I didn't give away 50, but my wife and I, for Christmas gifted a good friend one of our extra Gen 4 Glock 19 pistols, a 507C, CHPWS BUIS, a Mastermind AIWB and a box of Gold Dot 124+P. He didn't have a Glock, and we didn't think we could consider another shooter a good friend if he didn't have a Glock.
Today was the first time we were all together, and he was able to shoot it after a local USPSA match. I had zeroed it at 25 yards with Gold Dot prior to today. For reference, he is a strong M class CO shooter, shoots a Legion, and has carried a P2000SK .40 or P30L 9mm with a GGI trigger. We started at 20 yards, and I shot the pistol first, putting three rounds in the upper A, in about a two inch group and inch right of center. His shots were all low left on the head. I told him to try more finger and that helped, but his shots were still a few inches left. We asked my wife to shoot it, and her shots were right with mine. We shot some more, but ultimately went one click up and three right. At that point, he was slightly left of center, and the gun shot right of center for my wife and I.
I spent an hour transferring as much Glock info to him as I thought he could absorb (draw, holster, take down, cleaning and lubrication, downloading mags one, don't screw with the OEM parts!) I also let him shoot one G5 19 of mine with a Mayhem and another G5 19 with an EPS. Interestingly, he preferred the G5 trigger with the dot connector. He left carrying the G19 with a spare mag of Gold Dot in his front pocket, so I think we brought him into the fold. My guess is he would have shot a 365 Macro better -- the Glock takes some work, even for a good shooter!