Some of you may remember my thread about transporting a 1911 from FL to VA via plane. My dad built this gun many years ago and i finally have it here at home in VA. I had an armorer strip it all the way down, clean it in an ultrasonic cleaning tank and re-assemble it. They found a generic pin holding the hammer in but that was it. Fairly good condition for a "shooter" 1911. I put 50 rounds through it yesterday and on the 50th round it malfunctioned. It did not fire. I held the weapon down range for a few seconds then ejected the round. After that I dry fired it a few times and the hammer was not going down all the way. Also when i would pull the trigger (dry firing), nothing would happen the first time then on the second pull it would drop the hammer but only 75%. So, i want to order a stainless pin set and a new trigger from wilson combat. Maybe a new hammer too. The problem is I dont understand what they mean by "Fits: A thru O Pkg." for the pin set and "Fits: A thru I Pkg" for the trigger. Are they referring to the frame serial number or is this a wilson combat only thing? Here are some pics of the new to me .45 It has an Ithaca slide, Crown City Arms frame and Pachmayr grips. Most of it has been blued but shows alot of wear.