Xc1 issues - SureFire XC1 Ultra-Compact LED Handgun Light

I will start off by saying there are some positives with the light, it is tough( I know this because it keeps falling off my gun) and I like having a regular battery. It works ok inside of the house for lighting up a room but once outside past about 20 yards the beam is so weak you can not get a good view of your target. That was just running drills at home. Fast forward to the weekend after I bought it, I went to the range and after approximately 100 rounds it worked off the gun (Glock 30 Gen4) so I re attached and re tightened it again and at about another 100-125 round off it came again. So one more time and guess what same thingy. The attachment screw will not stay tight under recoil. I would stay away for the price there are way more reliable lights .