How to change speed of Siminov's weapons?

I have a DarkRP and I have Siminov’s Weapons on my server. How do I change the speed of it so when they pick up the gun they will still walk the same speed as everyone else?

Thank You!

Please elaborate?

Okay, in my DarkRP everyone walks/runs a certain speed so they don’t run like they’re on crack haha, but when you pick up one of Siminov’s weapons you walk/run a lot faster than everyone else and I want it so you stay the certain speed instead of being faster when you have one of these guns.