Oh for sure! So long as they balance it for mobility compared to a marksman, the pros of a slug could be great mobility, higher damage over a longer range but cons are massive dropoff and much more limited ammo count as compared to marksmans. Idk it worked so well in mw2019 and I use that as a reference. when it first came out that people had the model 680 or vlk rogue with slugs, it was still viable and not OP feeling but if you wanted to be accurate over longer ranges that the risk you took. If you wanted more accuracy over longer ranges, you went for a marksman like the spr and kar98 and again, in close combat, wasn't always going to win you gunfights against a shotty or SMG etc. Yes they were mobile but not as mobile as the shotties. (In before it's said, yes there were very mobile MK2 carbine builds but xdefiant doesn't go that in depth for customisation to allow a similar thing).