SWORD ART ONLINE: FATAL BULLET

After the latest update, I found that farming on extreme doesn't do the trick anymore for weapon proficiency. The current fastest way to increase proficiency is in fact to play on easy, and buy the weakest but fastest weapon of whatever type from the weapon shops, and assuming you're dual wielding which helps increase the process faster, fight either the boss in Subway A in the third area the Old South, or the boss at the end of Subway B.

The Subway A boss that you're normally supposed to run from while activating those 9 switches, killing it can increase your proficiency by an average of 50, while the boss of Subway B will increase it by around 30, but the latter is shorter to fight which can be more preferable with some of the weapon classes. I stuck to just repeatedly fighting the Subway B boss for the photon sword proficiency which took the longest to get to 1000 by far.

*Sniper Rifle and Gatling Gun are the only ones that don't have any kind of dual wield function (dual wield grenade launchers for the Launcher class), but with these bosses they didn't really take longer than the other weapon types. While using the Gatling Gun, I recommend using the Heat Detonator skill that is exclusive to the Gatling Gun class, which quickly discharges much of the heat level of the Gatling Gun, so use it as you're about to overheat to save yourself some headache of not being able to shoot for a good minute or so.


Things I did that made survival easier during the farming process, was just using the skills Armor Form (increase your defense) and Power Break Shot (lowers the enemy's attack power) on the bosses, while having one or more healer in my party, but to ensure they don't do much damage to the bosses, I just kept picking the order for them to rendezvous on me.

You can rotate between whatever characters though if you want to increase anyone's affinity during the weapon farming process, since returning to town after a fight increases affinity by a small amount and you'll be doing that a lot and for awhile, between fighting either of the area 3 bosses and returning to town to deposit or sell materials so you don't become overweight, or to restock on ammo, etc.

I thought I would just add my own experience of going for this as the other guide/comments were many patches out of date when I did this.
There is a mob in the White Frontier, Solo Stinger, that I used to do all my non-100% weapons on. He is located right above the Field-Icicle Prison and will continuously spawn Glacial Emperor Wasp's that can be used to level up all weapons (even swords with some effort). Leave the Solo Stinger alone and kill just the small bees (lvl 70's or lvl 190's on Extreme). If you do kill the Solo Stinger just run out of the area far enough to not see then run back and he will have respawned again.
Took me about 1-3hrs per weapon to max all of them up from various points out of the 1000. Pop on any skills you wish to also level up at this time, affinity characters, and all weapons/skills can be maxed fairly quickly. Just like the other guide suggests, do duo-wielding on all weapons that can, and just have fun.
The sword requires you to use your UFG gun or stun rounds to knock the bees down before smacking them to death. This of course took longer then any of the others because of this, but can be done in 3-4hrs I'd say starting from 0 (my experience). The sword/gun combo can actually be done with just the gun to level up or again knocking the bee's down and smacking them.

Also I had trouble figuring out where to locate the weapon proficiency list my first time, so for anyone who can't figure it out go to your character on the menu, click status, and hit x (switch display) to page 5.

Hope this helps anyone looking for another option at tackling this slightly boring achievement.