One feature which stood out to me when compared to other tactical light mounts, was the means of securing the light mount’s thumb-nut. Elzetta includes two (2) stainless steel cotter pins which can be utilized to secure the castellated thumb-nut, preventing loosening of the mount and the possibility of the shooter loosing his weapon light during operations.

There are two acceptable methods when installing cotter pins into castellated nuts. The first (preferred) method being the most common, has one leg of the cotter pin bent up and back over the top of the bolt the nut is threaded to. The second leg is bent down over the flat of the nut. With this method of cotter pin installation it is easy for the exposed legs of the cotter pin to snag on objects, to include the operator.

The second method of cotter pin installation would be a more acceptable alternative for this type of application. With the (alternate) method of installation, the cotter pin is trimmed to a length allowing the legs to be bent to the side and inserted into the adjacent castellations of the nut. This prevents the sharp edges of the cotter pin legs from possibly snagging or causing injury to the shooter. (See Figure 1)






Another option for securing the thumb-nut against loosening, is through the use of stainless steel safety wire.
(See Elzetta ZROC Review: http://www.weaponevolution.com/forum...ashlight-Mount)

The option on the ZORM of additional light security through cotter pins or safety wire could be beneficial to military operators who often find themselves securing accessories to their weapons with plastic zip-ties or 550 cord.