I've been shooting MX8s for over 10 years, and have never seen that happen. If he can push the safety slide far enough forward to release the trigger group, with gentle thumb pressure, there is a problem with the gun. Every one I have ever had or seen required much more than gentle thumb pressure to overcome the spring to release the trigger group. Some are actually hard to push forward enough to release it. May be nothing more an needing a spring replaced, or crud built up somewhere.
I would call Phillip Crenwelge, at Phillip's Gunsmithing in Texas, and talk with him about it. If it needs attention by a technician I would highly recommend him.
BTW, I never have to move my safety slide. It stays off all the time. But, mine is strictly a competition gun.
SRH
