Longbow synthesis is a good sniper rifle and it can be a beast with the right combination of perks, for the one you got on yours it's not a perfect combination. Spray and play is awesome on pvp but ok on pve, the perks you got on the middle column aren't really good for neither pvp or pve, firefly is awesome on pve and ok on pvp The best perks you could get on a sniper rifle like this are: PvE: outlaw, field scout, firefly PvP: spray and play, perfect balance, final round If you don't have a better sniper rifle I'd say it's worth to keep it, if you have something better like black hammer or ldr5001 with at least 2 of the perks above I'd dismantle it imo

Firefly is always a good perk to have.