I had a lengthy discussion with Jim Land in 2004 at the NRA Annual Meetings in Pittsburg, PA about the different types of scopes used on the 1903A4. He had his collection of USMC sniping equipment on display with the Dallas Arms Collector's Assn. He told me there were five scopes approved and used by the USMC. The Weaver 330, M73B, Lyman Alaskan, M81 and M82. I'm not sure about the Army but I'd say the M82 is perfectly acceptable as a correct scope on the 1903A4. I have one with the M73B and the M82. The Lyman scopes are so much better. I've never had a problem with eye relief using the Alaskan or M82 on my rifles.