In my opinion 5 levels will be better than 10 levels. less segregation of players.
Example.:
SMG
Rank 1: Low rate of fire, low ammo capacity, low caliber. These are the guidelines of this level:
-MP 28
-M3
-M3A1
-M50
-STEN
Rank 2: Higher rate of fire, higher ammo capacity, better damage.
-MP 28 (32)
-MP 34
-MP38
-Beretta M1
Tier 3: Increased rate of fire, higher ammo capacity, better damage.
-MP 35
-MP 40
-Beretta M38 (20)
-Beretta Model 38/42
-Thompson M1A1
-PPS-42
Rank 4: High rate of fire, large magazines. Good customs etc.
-Beretta M38 (40)
-Thompson M1
-Thompson M1928
-PPS-43
-PPSh-41 (35)
Rank 5: Best rate of fire, Large magazines, Good accuracy.
-PPSh-41 (71)
-Thompson M1928A1 (50),(100)
-LAND
-Cönders
The same goes for rifles. Example.:
Tier 1: Short Repeating Rifles:
-Arisaka Type 38 Carbine
-Berthier Model 1916 Carbine
-Carcano M91/38 7.35mm
-Karabiner 98k
-Mosin Nagant Model 1907 Carbine
-Mosin Nagant Model 1938 Carbine
Tier 2: Long Repeating Rifles:
-Arisaka Type 38
-Arisaka Type 99
-Arisaka Type I
-Carcano M91
-Gewehr 1888/05
Tier 3: Semi-Automatic Weak Caliber Rifles:
-Type Hey
-Type Ko
-Type Otsu
-Gustloff Volkssturmgewehr MP507
-M1 Carbine
Level 4: Self-action rifles with a strong caliber:
-M1 Garand
-Type 4 Rifle
-Gewehr 41
-Gewehr 43
-SVT-38
-SVT-40
Tier 5: Fully automatic rifles.
-FG42/1
-FG42/2
-AVS-36
-AVT40
-ACT-40
-Krieghoff Paratrooper Rifle
Fully automatic assault rifles. Should start at level 4. Example.:
Tier 4: low rate of fire, moderate accuracy.:
-M2 Carbine
-M2A1 Carbine
-Fedorov Avtomat M1923
-MKb 42(H)
-MKb 42(W)
-Thompson Light Rifle
Tier 5: high rate of fire, good accuracy.:
-Stg 44
-Sudayev AS-44 Model 4