Stupid error that pisses me off

[HJGF]

ur shotgun uses the same index of another wep in a kit example u cant have a bar and sg44 in the same kit yry to check that

[Apache Thunder]

Index conflict means you have a weapon on the kit in question that occupies the same "index" as the weapon you tried to add on. You can either remove the SG44 or change the index of the shotgun/sg44. By the way, index = the key you use to activate the gun. Knifes are typically index 1 for example.

[HJGF]

is on the first lines of the gun look for it but example remove the pistol and change the index to 2

[RuBBa_cHiKiN]

Basically it occupies the same slot as the gun in the original kit.