Bonesniper, since you did not mention the manufacturer of this upper (came off an EA lower does not inherently mean an EA upper, LM marks= LAR/Martin Marietta (Army Spares Contract) or overall condition, it's assumed to be a used "mil spec" upper. Considering you are selling a used barrel ($100 to $150 at best), a used A2 upper receiver ($100-$125 at best) and handguards, gas tube and Delta ring assembly ($35) you are in the ballpark of $235(low end) to $310 (high end).
FYI, you can buy a New In Box 16" A2 Rock River upper complete with Bolt for $375.
The rules of this forum are to post an asking price. Kevin will edit you post.