*** A note to all seeking modding help / advice ***
When asking for advice or help with a modding question it is best if you include as many details or specifications pertaining to what exactly it is you are looking to achive in your modification.For example ;
Which game mod are you referring to ? ( BF1942 - Desert Combat - DC_Final - etc )
What map and gameplay mode are you referring to ? ( Gazala CTF - Bocage Coop - Wake Conquest - etc )
Which vehicle or weapon are you referring to ? ( AH64 - M1A1 - MP5 - AK47 - etc )
Which projectile or bomb are you referring to ? ( SA-7, .50cal, 9mm, etc )
What exactly do you want the weapon or vehicle to do with your mod idea ? ( go faster, handle better, more power, etc. )
What exactly is it that you are trying to do ?
Make sure that your question is typed clearly, understandable and preferably spelled right.
( it only takes less than a minute to first read what you have just written before you click the "submit" tab so that when others read it they will know what you are saying )
Providing more specific detailed information in your modding questions will result in a quicker solution and answer by reducing additional inquiries as to what it is you are trying to do. 
It will help us to help you better and faster.
right ? makes sense ?Thank you