Basically, it's HD/PS2 Vortigaunt (Alien Slave) with its original texture from High Definition Pack for Half-Life/Blue Shift, instead of low-quality texture of the model itself.
UPDATE v2 (09/15/2021):
I've noticed that OF model, despite having smaller texture size, had more bones, so it didn't have a broken vertex on the left side of Vortigaunt's chest (which can be seen in "jabber" animation from Half-Life model - thank you, SouL_BreaKeR, for noticing!). So, instead of finding a way how to fix HL HD model (which I posted here before), I've decided to retexture the OF one and recompile it for HL & BS as well, so here it is!
Made with Crowbar and Fragmotion being used for compiling and re-texturing. All credits go to Gearbox Software.
Actually i NEVER noticed this. Maybe because vortigaunts just appear few times in the whole game
I think the OpFor ISlave just being the ported PS2 model really shows just how rushed the HD pack really was.
Indeed, i still prefer the HD models over any other SD or UD models. I know thousands of Half-Life fans hate HD pack so much, but i love it xD
Does it mean this model works perfect for Half-Life and Blue Shift too?
It has all the same animations from HL model (+ three OF ones, of course), so yeah, it should work.
can hd slaves be headshoted now
They couldn't? :/
Play Half-Life with the normal HD models. Shooting alien slaves in the head doesn't do any extra damage. Then turn off HD models and shoot the non-HD alien slaves in the head. I normally fix the problem by replacing the HD alien slave model with the one from Sven Co-op (which has a proper head hitbox damage multiplier).
It's weird and hard to explain, but yes, the simple change in graphics appears to make them take normal damage from headshots.
Nope! Still broken. I'll have to try the Sven model fix you mentioned.
UPDATE v3: Fixed all Vortigaunt models for Half-Life: Decay. Now they have the proper texture too.
Bro you should upload this magnific fix to Gamebanana too.
I'm too lazy for making extra screenshots for GB... :\
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Does this fix the hitbox?