OK, got another question. I see old, 4 & 5 digit serial numbers, with no safety. Then like one of mine, Forward pivot pin and what I call a cross bar safety. Small square piece that slides thru the hammer to engage the safety. Then like my other frame, easy open, pivot pin above the trigger and fire selector/safety lever on top of the hammer. Here's my question, I see some with the easy open design pivot pin above the trigger and the cross bar type safety, were some frames made like that or were all of these sent in for the easy open conversion?