This is best used by pairing a tac-14 with a tec-9, features 100% accuracy, high reload speed, mobility.
Weapons are interchangeable obviously, you can still do fine with a sniper or a glock auto. Back 4 blood has a lot of RNG and you can't always have the best attachments and weapons.
Clear commons with your tec-9 and let your tac-14 handle mutations. Karlee as starter is recommended for the tec9 but feel free to play whoever you want.
The tec9: If you've ever played karlee, you might have noticed that the tec9 is the best sidearm once you gives it reload speed. Combined with 100% accuracy and some damage cards, the tec9 might as well become a primary.
The tac-14: High damage, perfect to kill mutations at mid and close range. Improved with high reload speed, you can then shoot faster as it's a pump action. Since you have 100% accuracy and all pellets will hit, you'll always have a 15% dmg from shredder on anything you shoot at, so with this build you have a 40% damage bonus which is pretty high. A 130 body shots turns into 186.
Recommended attachments : stumble dmg, reload speed.
Core cards : All accuracy cards, mag coupler, ammo stash, run like hell, widemouth magwell.
You can do whatever you want otherwise, not forcing you to pick these dmg cards, I just think it's the most efficient cards with this deck so you have slots to pick other cards. Speed demon and scattergun is just cherry on top, but if your team needs you to pick team cards, go ahead.
