Bought Silencers (Combat Arms)

I mean how people buy silencers in Combat Arms, different grades and types:

Light Silencer (GP or GP Crate) [Private or Corporal]
~Durable Silencer~ (GP or GP Crate) [Sargent]
~Heavy Silencer~ (GP or GP Crate) [~]
Silver Silencer (ZP or ZP Crate 1 day use) [No limit]
Gold Silencer (ZP or ZP Crate 1 day use) [""]

Just for assault and SMGs (Maybe Pistols [Light Silencer]), snipers don't get any due to it's power. (Thinking of exception for M700)

Rifles: Light to Silver, Gold
SMGs: Light to Durable, Gold
Pistols: Light, Silver
M700: Light to Durable

It would be unfair for people to keep these for a very long time so:
(GP items 1 day use/ZP 3 day use)

Light: 1,000 GP
Durable: 3,000 GP (MP5-Advance/Micro Galil-Advance = Permanent for duration of gun)
Heavy: 5,000 GP (M4A1-Custom = Permanent)
Silver: 2,000 ZP (M4A1-Silver = Permanent)
Gold: 5,000 ZP

~The grade of each silencer is questionable.~

I searched this and nothing came up to me, if found, post link please. And sorry for the lack of colors, codes/textiles are a bust for me.
I also hesitated to post this.


~ = *Questionable/Subject to Change*

~Heavy and Durable Silencers may have same power due to sound of M4A1 Silencer and MP5 Silencer. (Durable may be taken out of list)~