Must have item - KNS Precision AR-15/M16 Gen 2 MOD 2 Non-Rotate Trigger/Hammer Pins

If you've ever experienced trigger failure because of a retainer pin walking out on you, then you know this is a must have item. I had it happen only once and spent a lot with my local gunsmith to repair the damage which ultimately ended in selling the rifle. Since then I've used KNS non-rotate pins on every build. Is it really necessary? Maybe, maybe not. But I, for one, am not willing to sacrifice any AR build to anything less. These kits just work...oh, and they look cool too!