8th slot weapon pack problem

Hello 

The 8th slot weapon bought is really bad, i had sure 3x head shot but was killed, on 1 person.
The gun is like air, it don't hurt other players.

it was aroud 490 wrc mp7a1 pack  but after last maintenance the problem was there 

i cannot choose the weapon first , i need something else , then click the weapon but mostly don't work.

i lost many kills .. and be kicked..