I don't want to bash your thread, just share my experiences with that set-up. In my opinion, here's the problem with that sighting system:
I've gotten to shoot quite a few G36's while here and the German marksmanship course that requires the usage of the G36. The course they run here is modified and more stringent. It requires 1 shot on five seperate targets (about 2' apart) in 8 seconds, then another string at 6 sec, and another at 4. This is done at two different ranges, 20m then 10m. You get to sight in with 5 rounds, but not adjust the sights. It's only so you'll know where to "hold". The only optic allowed is the red dot (the magnified takes too long anyway) and the eye relief is poor.
The biggest problem is the height of the optic. Guys were unwittingly canting the gun to one side which was completely throwing off the POA/POI due to that tall optic. Bench shooting is fine, but anything that requires fast transitions is tricky unless you get used to the weapon. Unfortunately a lot of the guys here had never even seen let alone handle or shoot the G36.
We watched a Marine General's Army PSD guy shoot the pistol version 7 TIMES to pass, and while inspecting the pistol target, the German doing the grading pulled out his USP/P8 and fired a round into the target for him to even score bronze!!! Then he complains that he's not used to the length of the G36 (not short like his M4) so they obliged him with a G36K which he proceeded to fail on as well. Embarassing.