I carry a regular brush gun (with forged receiver), among other weapons. If someone carried both, it wouldn't really be redundant both guns have their niche.
Vendortron sells Anti Materiel Rifle GRA after level 16. The Anti-Materiel Rifle is a long range sniping weapon though, and the Medicine Stick is a short to mid-range rifle. If you have no weapons with GRA it means you dont have the weapons that are compatible with GRA mods. So many of them are installed that it will be hard to figure out what is causing this, and I think that adding another mod that lets me buy weapons and upgrades would be easier to manage. The following is based on Fallout: New Vegas cut content and has not been confirmed by. I have found one out of 6 weapons that can be modified, even with the WMX mod installed. Anti-materiel rifle - the common variant found in the Mojave. There is nothing in my game anywhete with 'GRA' in the name. This is the one I use, but there are others if you don't like this one: There are mods that fix this if your interested. You cannot put GRA tagged weapon mods on weapons that don't end with GRA in the name. The way the game sees it, 'Anti-Materiel Rifle' and 'Anti-Materiel Rifle GRA' are two completely different weapons. All I can think of is that one of my mods probably messed with the item lists, but I'm not good enough to know what to do about it.
I've checked my inventory, I have what the wiki said I need. Everything I see in the gun runners vendor is as it is listed on the wiki
