I use a 50 yd zero on all my AR's 15's and 10' I just believe it the most practical zero. An AR15 with a 2.8" over bore scope zeroed at 50 yds using a 70 gr RDF gives approximately 1.5" inches high at 100 yds.
The OP really doesn't care. He's trying to buy a Sig slide and won't listen to anyone on how to become a member and buy it. So, he thinks he can generate enough posts to get PM privileges. He's flooding the forum with nonsense posts.