Hey guys and especially @Protectandserve, I've purchased two M1A rifles about two years ago and I've been too busy to get them both zeroed. I'm finally taking a few days off from driving a truck across the country and going to finally get both of my M1As zeroed at a 100 yard indoor shooting range. My dad even gave me a Caldwell Led Sled for Christmas. Never used one of these before, so it'll either make this easier, or far more complicated.... but I'm leaning towards easier. The trick is, I've never personally zeroed an M1A, only M16s when I was in the service, and that was a decade ago so I'm would be alittle rusty with that. I've seen a few youtube videos, but anyone can make a youtube video. For those that do know of reliable youtubers, which one would you recommend for zeroing an M1A? So I'm not going this completely blind, but any advice to smooth over any rough areas of the process would be appreciated. Oh, by the way, I'm zeroing my Socom 16, with open sights. Want to eventually get it zeroed to be pinpoint accurate up to 300 yards. (Yes I know I can't zero a rifle to 300 yards at a 100 yard range. The indoor range is just the first step.) And I have my M1A Precision series, with a picatinny rail with Nikon M-308 optics, and want to get the open sights zeroed out to 300 yards as well, and get the optics zeroed out to 600 yards. (The optics say they're accurate up to 800 yards, but lets say I want to be realistic and have full faith I can hit a target at 600 yards). Don't mean to post all my equiptment as if I'm bragging, just posting them to give full information so you guys don't have to ask what equiptment I have.