I know the proper sight picture on these H&K knock-offs, but I cannot get this thing to zero at 25yds. Its about 4-5" high at 25yds and I have the tallest front sight on it, and tried all the rear adjustments. I spent two hrs trying to figure it out and went home. Does anyone know if im missing something here, or does someone have a cheap red dot for <85$ that actually holds, as in the dot doesn't need to be co-witnessed with a front post to achieve accuracy? Looking for opinions guys!