Semi .338 rifle?

Some one-man-portable automatic grenade launchers...

XM174
The XM174 is a mounted automatic 40mm grenade launcher heavily based on the M1919A4 machine gun and the M79 grenade launcher but fed from an ammo can. It was used in the Vietnam War as a tripod mounted crew-served weapon and as a weapon mounted on various vehicles and aircraft. It uses the same ammunition as the m79 (40x46)
Short description and characteristics
picture (best from what I found...)

And modern one - AGS-30
AGS-30 image
30mm rounds for AGS-17/30 (I think its VOG-30)
Ammunition used in the AGS-30 (HE and smoke)
Picture for grenade belt

hi please it is a posible add m39 smoke hand grenade ?

While not too unusual or exotic, there are some .45ACP pocket pistols, which might allow for a more potent sidearm than the Makarov for mercs who've devoted their entire kit to carrying... things that aren't pistols. Slim-grip models often hold 6+1 and could use the 7-round mag object. There's a Springfield XD derivative, or the Taurus Milennium .45, off the top of my head.

Is the maximum item mass limit still at 25kg or wherever it was? I think we can carry corpses around now, so I think that limit's been raised. The M2HB wasn't brought in before because it would break the old item mass limit.

As it is, it would be overkill anyway, since there aren't that many vehicles to shoot at. I myself suggested the Kord 12.7mm Soviet "light heavy" machine gun knowing it was overkill, but it fits a bit better in the more mobile sort of campaign JA2 tends to have. Plus, you can fire the Kord from the hip, which isn't very practical but it's just the sort of ultra-macho nonsense some of our mercenaries would participate in.

In JA2 gameplay, the M2 is a very poor choice. The good old bonesaw or its descendant together with an assistant gunner to load it will put three times the rounds down range which, while losing 40% in individual damage, more than make up for it in total damage per turn and suppression effect.
Also, it's heavy and just using rifle animations for it looks stupid. Maybe if we ever get gun emplacements in. Also, the original role of the M2 is downing aircrafts and gutting armored cars, both of which are distinctly absent.