An - Use it with all words that begin with VOWEL sounds.
There are some exceptions tho if there's a silent H you use An also same with words that are spelled like consonants but pronounced with vowels.
What have you learned?
It's: "... give me a war system".
You should also consider using the plural for "gang".
Thanks for taking the extreme basic English course with me your host - 0x_.
Next time we'll learn how you properly ask people on the internet to do a complete system for you (including compensation)!
b2t: Please, oh please search the sa-mp.com forums for filterscripts there are enough of them.