you cant edit it.. u can change it.. ok i will teach u.. first , go to Blackshot/Data/item => take the wea pon . kf file that is the file what u want your original weapon : E.T.c : Mp5 =\-> hk f ...... so u take hkf . kf and paste somewhere like desktop... then copy Blackshot/data/character/handanimation and find HandAnim_hkf . kf.
paste anywhere : Desktop.. rename it to mp5.kf / Handanim_mp5.kf then paste back original place