What is meant by "firearm", both primary and secondary weapons, only not heavy weapon? Gunslinger last perk increases "firearm" damage for each teammate by 10%.

I have the game in my account but never played, truly like left4dead and other types of horde shooters, but I want to know if the game is balanced for solo play since i dislike to play with random people. Can you beat the game in the last difficulty as a solo player? If not, which difficulty is the most appropriate for a solo player that likes a challenge?...

已经有几个朋友加入了不过时间不是很固定，后续能找更多性格好的游戏搭子保证随时能喊到人玩

Is it supposed to increase or decrease the damage Saber? https://steamproxy.net/sharedfiles/filedetails/?id=3241934385

I have 100-300 ping in co-op games help to fix it!