got a call this morning from the women in black to do a longevity trial on a nvg for the philippine army it had to be mounted on a 7.62 gas rifle and fire 300rd with no loss of zero or damage to the unit the rifle they showed up with was a mk11.... 300 m118's later and about 24 ftf on diffrent mags i was disappointed after that we cleaned it scoped it and tried for some 300meter head shooting 4" with me behind the gun i was not impressed