"For a moment he felt good about this. A moment or two later he felt bad about feeling good about it. Then he felt good about feeling bad about feeling good about it and, satisfied, drove on into the night."
-- Hitchhiker's Guide to the Galaxy --
1) The Germans are known for being thorough and meticulous.
2) HK probably did testing to see what it took to damage the gun and/or affect performance.
3) This could be due in part to the issues Glock had with the Gen 3 40 caliber guns. The pistol lights pulling down on the dust cover allowed the slide to cycle faster and the magazine couldn't keep up.
The good news is that lights and lasers are trending smaller and lighter. And if this monster is good at 5.4oz, then just about any pistol light should be good to go.
http://www.steiner-optics.com/laser-devices/dbal-pl
Just a Hairy Special Snowflake supply clerk with no field experience, shooting an Asymetric carbine as a Try Hard. Snarky and easily butt hurt. Favorite animal is the Cape Buffalo....likely indicative of a personality disorder.
"If I had a grandpa, he would look like Delbert Belton".
This is getting interesting.