I believe they are different, hmm.
BAR*: $200000
Dual: No
Damage: 9
Spread: 0.1
Freeze: 0.2
Fire Rate: 0.24
Reload Freeze: 0.20-0.30
Auto: Yes
Clip: 25
Sten*: $65000
Dual: No
Damage: 8
Spread: 0.03
Freeze: 0.185
Fire Rate: 0.3
Reload Freeze: 0.12-0.18
Auto: Yes
Clip: 32
M4*: $55000
Dual: No
Damage: 8
Spread: 0.1
Freeze: 0.1945
ROF: 0.30
Reload Freeze: 0.30-0.35
Auto: No
Clip: 16
They are close but not so much, BAR's price is because of its ROF and because it deals 10 dmg, it also has a big clip as well.
http://www.era-go.com/forum/showthre...und-Era-Part-I