Evolutions:
1. There's only one choice here. Incarnon mode has no recoil. Even if it can proc headshots, we're mainly going to be shooting at the legs for this one.
2. Riddled Target. Free multishot on all puncture procs is really nice, and the weapon has great innate status.
3. The weapon recoil is probably the nicest here, but it's all preference. The middle path is bad.
4. It's really tempting to go for the other two paths, but Flensing Spikes is definitely it if you don't have other means of removing enemy armor. If you do, go with Critical Parallel.