Not until at least 55 when you get slug shot and have access to M Kris.
Our pre-SS weaponskills suck, so there isn't much to augment them with other than RACC.
Once you get slug you definitely need RACC to hit it. But you want that for regular TP gain as well, so there isn't much difference in setups if you are shooting. So pre-70 I basically had a QD gear set and a TP/WS set. Once i got a joyeuse I had TP, WS and QD sets. Then once I got Detonator, I had TP, Slug, Det, QD sets.
So I wouldn't worry about a WS set for now. At 40 you'll benefit from a QD set that swaps in some AGI gear.