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The GR9's scope texture is messed up.
Forward hand placement is strange when no short underbarrel grip is present, fingers clip and appear to be floating.
No magazine model is present if no magazine mod is selected.
Magazine stays in place when reloading. Also, you can see the hand snap into place in an unsightly manner after the reload is finished.
Not so much a bug, more lack of commitment to authentic animations, but the GR9 does not reload as it should - currently, it reloads like an AK-style weapon with the magazine rocked in and back, which is not at all how it actually works.