NcSTAR MPR45 45 DEGREE OFFSET RAIL MOUNT/WEAVER STYLE

$2 Cheaper on Amazon ($7 cheaper shipped).

$5.99 with free prime shipping.

http://www.amazon.com/NcStar-Weaver-Style-45-Degree-Offset/dp/B004941DUE/ref=sr_1_1?rps=1&ie=UTF8&qid=1464120015&sr=8-1&keywords=ncstar+ar15+wrench&refinements=p_85%3A2470955011