Before we talk about gear lets briefly digress into skills you haven’t unlocked yet. Eventually you’ll unlock mutations @ lvl 2 & 7 that are really good for PvP. You are going to want to pick these because you can litter more scrap traps around the maps at entrances and exits to your/enemy base beyond the one you use to hook/trap your current focus. This means that a low health enemy running from your base or running to their base can get blown up w/o you even being present.
Now on to the gear. Reload speed and attack speed / crit dmg gear is what you want in addition to your Symbiotic Gauntlet. Here are the reasons. His primary weapon being a shotgun means its mag size is pretty small, so for sustained DPS reload/attack speed is crucial. The crit dmg bit comes from the fact that once an enemy is in your trap they are stationary so you can get guaranteed crits and crits do significantly more dmg than non crits. So you can kill all but the tankiest characters if you can land those crits at lightening speed, hence the recommendation for reload/attack speed. Basically once an enemy is hooked and trapped they are going to die because it’s crits all day everyday, especially when you are lvl 9 and above due to the 15% dmg debuff that Easy Target provides.
Now the reason why I have attack speed hyphenated w/ crit dmg is because there is an epic piece of gear whose primary stat is attack speed and its secondary stat is crit dmg. Another option is to replace attack speed w/ a legendary item called the Vigilant Power Scouter. It boosts crit dmg and its legendary effect is that it increases the next attack after a crit by 9.1%. So if you are full health and wearing the Symbiotic Gauntlet your attack dmg can be boosted by a total of 27.3% and since crit dmg is a multiplier on top of base dmg landing consecutive crits does MASSIVE dmg. So you may want to spend some time in PvE farming for the Vigilant Power Scouter so you can lvl up and unlock those mutations and then take them in to PvP and wreck!
Finally, a pro tip. Put two scrap traps centimeter apart, hook an enemy into either one, shoot him/her in the face and a split second before the stun wears off position yourself so that when the stun wears off you can quick melee them into the adjacent trap. It’s hard to pull off but really satisfying when it happens.