It’s not like TI is trying new things. The side folder is largely used by Chinese Army 30-40 years ago. The under folder is from Type 56-1 which was standard issue rifle also 40-50 years ago. They just bringing different styles so they can sell them even u already have a T81 at home. T81 under folder was first designed back in the 90s to export to US(as T81S-2).
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I want to say the front sight at this position looks more balanced.