3 Commando Brigade

[Suggestion] MP5 Pack

What you really want is the L22a1 or L22a2 carbines for pilots / tank crew:

http://world.guns.ru/userfiles/images/assault/as22/sa80-l22a2.jpg

Yes deffinetly Evrik, not sure how difficult it would be to model either because it is basically an L85 trigger mechanism with a cut down barrel.  So you could just cannibalize the L85 model...

The only sad thing is the way that Arma 3 ammo works and to allow multiple weapons of the same calibre use the same ammo, the config for the velocity of the rounds are configured in the ammo not in the weapon.  This is why the L85 and L86 have exactly the same muzzle velocity in game whereas in real life the L86 is slightly more powerful.  So all in all, we could use this weapon but where it would have a lower MV in real life due to the shorter barrel in game it wouldn't.

Not sure about it being less 'powerful' as it still uses the standard 5.56 NATO round, and due to the design, it still has a barrel length similar to the M4. It is definitely only accurate to around 300 meters, but as it is a crew weapon, that is preferable to abandoning a vehicle with just a sidearm.

The dispersion of the shots can be modelled at the gun level, rather than the ammo, so it is possible to create a difference in accuracy.

Pilots, according to one member ex-RAF Regiment, used the standard L85 iirc.
Tankers one would imagine, would use a shorter carbine if it was available.