You are restricted to what weapons you can use by your rank. Rec.s are not alloud to ask permision to use anything but the Kar98 and the M1 Garand. The following is a list of the weapon resrictions for higher ranks.
Pvt.-Kar98 and M1Garand
PFC-M1 carbine and Kar 43
Cpl.-Mp 40 and Thompson
Sgt.-Sniper:When there are more than 10 people in the server
SSgt.-B.A.R and STG44
If you are above a recruit you may ask permision to use a gun that your rank does not allow you may ask permision by saying ptu and the the gun you are asking permision to use.