@BTK420247 The spec you posted looks solid. The +4 grenade Stockpile relic and BBB are really only optimal for a pure grenade build, but not for splash overall… But pure grenades is a super fun challenge! IF you were to go that route I suggest:
-Fastball
-Explosive relic
-Corrosive, Fire, Shock BoTA
-Blue Expert Grenadier with +6 to Steady, +5 to Grenadier
As far as an overall splash / explosive damage build, try using the explosive relic with your favorite explosive weapons. A great one to try is the Swordsplosion. And a shield to alternate when survival is more important would be the Antagonist or the Blockade. Both are very tanky on Axton since he has quite a few shield buffs. If you are running an explosive Axton, I also recommend:
-DPUH
-Baddaboom
-Ravager
-Ogre
-Legendary Soldier
-Legendary Engineer
-Blue Expert Grenadier with +6 Steady, +5 Impact
-Purple Expert Grenadier with +5 Steady, +4 Impact, +4 Grenadier






