Just figured id pass this along as ive never seen a fastfire mount made special for the 930/935 receiver. It looks like they make a lot of great stuff for the 930/935. If you own a 930 or 935 check em out.
http://www.or3gun.com/OR3GUN/about_or3gun_sightsaddle.htm
Fits on an 835 also. Installed mine today.