i just did

http://i.imgur.com/hAUrJPG.jpg
http://i.imgur.com/dxRnFBl.jpg
http://i.imgur.com/PQlZDdd.jpg
http://i.imgur.com/WxBbpCU.jpg
http://i.imgur.com/8uaGX5F.jpg
http://i.imgur.com/opDB57G.jpg
http://i.imgur.com/vflL2bz.jpg

https://en.wikipedia.org/wiki/300_AA....62%C3%9735mm)
http://www.aimpoint.com/us/products/...oduct/CompM4s/
http://www.advanced-armament.com/CYCLONE_p_451.html