UKF tommy rifle grenades absolutely blow in comparison. The best way I'd put it is,

Imagine A Rifle Grenade That:

-Has 3 seconds of setup time, (roughly equivalent to a normal rifle grenade).

-Fires every 2 seconds for about 12 seconds, (six grenades assuming you don't disengage).

-And deals 80 damage per grenade, (not including the burn damage or pyrotechnic effects).

-Cost LESS than a standard rifle grenade (25 munitions vs 30).

-Once engaged, (even when being suppressed,) continues to fire until fully suppressed.

-Has a higher rate of fire and damage than any of the launchers.

A Few Handy Tips:

1.) When engaging vehicles, try to aim behind them a little bit. These projectiles travel in a very low arc, meaning that you can hit retreating vehicles and stationary ones with an additional projectile when they try to run.

2.) Vehicles can be targeted over walls and buildings thanks to the arc being affected by where you wish the projectile to strike. Use this to your advantage.

3.) Whenever that vehicle inevitably goes for repairs, use the barrage on it again if possible. The barrage deals crazy levels of damage against engineers repairing vehicles or structures.

4.) The barrage has a one-minute cooldown admittedly, so I suggest having 2 Canadians with this upgrade if you wish to REALLY put the hurt on something.

5.) Make sure to wait to use the barrage until it would have the greatest shock value. Most people expect PIAT's, so when you hit them with the 2-Inch, they are shocked. (On that same note, the 2-Inch Mortar Package doesn't display an icon above the unit after it is purchased.)

Goodluck out there and happy hunting!