In case you did not realized a simple fact *but i am sure you already did*,there is not nor there will ever be a build that never bites the dust,especially in the hand of a novice.
My suggestion is to postpone the use of 10 luck sniper because in this session they were heavily nerfed.(only team support in pvp)I am a lover of .223 bullets myself,i know it s hard,but it s necessary to admit that best possible build to begin with is a spammer.Let's take a closer look.
4 str (with weapon handling perk you can wield both laser and small guns)
7 per (decent field of view)
10 end (max hp)
3ch (you can buy,sell,lead people in the field,make quest)
5int(enough if you don t screw up in bullshit stats)
10 agi.
1lck(ouch)
Tag small guns (180% at level 24,you need at least this much for brof,wich is vital you'll see why),outdoor(120%is enough),Energy(the rest.).
3 weapon handling (allow you to wield laser rifles)
6 strong back (you need to carry a lot to build up your empire.)
9 whatever,even tougher,bonus ranged damage.Even tougher might be best for you.
12 action boy,one more ap.
15 action boy,so now we got 12
18 bonus rate of fire (NOTE:YOU NEED 180 in a combat skill for this!) 1 less ap usage per attack action.
21 lifegiver,hp plus20
24 lifegiver,hp plus 30
Fast shot,fast metabolism. 244 hp
What we can do:It can carry quite some stuff,he can tear apart any critter in a turn with laser rifle-plasma (six shots in a row at lvl 24,6x40avg dmg,makes 240 dmg per turn),can use your sniper rifle (4 shots per turn,150 damage on avg critter,more or less)-can use all guns you can find easily around every corner,got a lot of hp,can do any social action,barter,interact,get quest,lead on the field,he can kill any non-ape player in a turn,all around very strong and efficient.Also just wait for some seconds if wounded,he auto heals very fast.
Good luck,seek your hides for the tent one square under ghost farm near modoc,lots of brahmins there!