Set screw holder and screw comes loose glock 17 - Meprolight R4E Full Size Glock Only Optimized Duty Sight Set

The sights, in my opinion, are just ok. The set screw holder, come loose, and the set screw will not stay tight. This is not a press in type sight. I have tried a drop of lock tite. This is just personal, but I think the press in type of sights for the glock are better. The sights took about 100 rounds to get accustomed to. The fine lines on the rear sight??? am still not impressed. Am going to ask optic planet if I can return. I hate to give negativity as Meprolight is an excellent product, but just doesn't fit my need.