It would be nice to have access to all the new rare weapons somehow. I've seen the 5 or 6 different ones but after about 30 hours I still have only managed to use the Morelli for more than 2 minutes.
For testing purposes I propose one of the following:

1. Make them available in the armory for a normal price so they can be bought.
2. You respawn with the weapon you died with, even if it's a rare.

Right now it's nearly impossible to properly field test them.

EDIT: So far:

'pepperdust' sucks, Mossberg is better.
Morelli is nice, for a shotgun.
F2000 is no better than an AK/G36, not even worth picking up.
P90 is AMAZING. Fifty rounds, ridiculously high firing rate, great accuracy...
AKS-74U is pretty good too.

_________________
Moderator /u/Myrandall of the RWR subreddit.
http://www.reddit.com/r/RunningWithRifles

This is pretty easy to create a mod for actually.

Take a look at *RWR-folder*\media\overlays\modulaatio.invasion\weapons\all_weapons.xml
Hint: change in_stock to 1 for all the rares to make them available in shop.

Only problem is I think the Armory might not support that many weapons currently. Dunno if this changed in one of the later versions. Newa had problems with his mod in this regard.

- The pepperdust is definitely NOT a bad weapon. When used correctly you can gain a LOT of XP (stun the enemy then stab them --> 2.5x bonus XP). Of course the use on open field is quite bad, which is case for most of the shotguns anyway. So if you find one on stalemate (in invasion) better put it in your stash for use in the next map.

- The Benelli M4 is a very good shotgun, still not imba.

- The F2000 is terrible hehe, actually we didn't tweak it yet but you can bet that it will be better in future updates.

- the P90 is indeed amazing, a tad too much imo, might be rebalanced a bit.

- The AKS is very good and ok as it is, imo.