Been using the HTI the entire game. I used to be able to 1 or 2 shot any chopper with LV2 Vehicle Destruction plus the medal but now that it's LV4 it now takes 9-13 shots to down a chopper. Seems to apply to any sniper rifle that I use, even unsuppressed. I can still use the Grenade Launcher to 1-shot choppers just not sniper rifles. I think Vehicle Destruction is glitched at Lv3+.
i just picked up this weapon last night and noticed weird behavior as well.. (Playing on PC). I'll break it down as best as I remember... (I think I have 3 or 4 ranks in vehicle destruction)
- I acquired the HTI weapon for the first time
- I alerted the base by using it to shoot a generator (UN-suppressed)
- I blew up several vehicles (cartel & unidad road vehicles incoming reinforcements) with a single shot to the engine block.
- I destroyed helicopters with 1 or 2 shots
- I attached the suppressor (went into the load-out menu and applied it there, it wasn't configured with it on previously)
- I shot at a few long range targets to hear what it sounded like suppressed, I noticed I wasn't destroying vehicles as easily
- I removed the suppressor to see if the damage changed. It seemed to have the same damage with or without a suppressor after that.