Mistakes: 1. Selling it. (But I got it back!) 2. White Lithium Grease. ( Slows down the slide. ) 3. Over lubrication. ( Throws fluid like an infant. ) 4. Titanium Striker. ( Only good for light primers/comp shooting. ) 5. Aluminum Trigger ( Pinches the shooting finger. ) 6. Not buying extra parts. ( Spring cups. Those who have been there know! ) 7. Over cleaning the Glock. ( Waste of time and materials. It's a Glock! ) Successes: 1. Tungsten Guide Rod. ( 425% heavier then the plastic and will not wear, chip or give in to warping like the plastic guide rod. Provides recoil control. ) 2. 3.5 lb connector. 3. New York #1 Trigger Spring. ( Lasts longer and will not "stretch" out like the original. ) 4. Titanium Plunger 5. Extended Slide Release. 6. Microlon Gun Oil and grease 7. XS Sights 8. Sandpaper Grip Decals. ( I own a Gen 3, not a 4! ) 9. Having spare parts for everything! Have something you would like to add or comment on?