I love the green triangle for anything from 5 ft to 200 yards. It's very fast for CQB and is surprisingly easy to nail a 12" plate offhand rapid fire at 100 yards. I was concerned it would be too large, but it's fine. I think part of that is that it's not a big dot, and you can play around with the triangle in terms of how you zero it and what kind of sight picture you want. I don't think the German would be very good for BAC, and the triangle gives you kind of a pumpkin on a post, which you might like being accustomed to irons.
I have a TA31-H on another gun, and while I love looking through the ACOG, the TR24 is more versatile. It's much better close up (5-20 yards or so) on the 1X setting and is just as good for me at 200 yards. What the TA31 has over the TR24 are ruggedness, weight further back, and the BDC for longer ranges. However, if you will rarely shoot beyond 200 yards, the ACOG offers no advantages in actual sighting, imo. The ACOG can be used via BAC up close, but it's not quite as fast as the TR24.
Also, I find the green to much easier to acquire quickly and I have never had difficulty with it against green foliage background.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. - Confucius
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