短答案
从 Marcus 的Gunfire / extra-shot engine路线开始
Normal and Hard are the best places to learn the route; on Nightmare or above, take survival before a conditional crit package.
这里的“推荐”是根据难度风险和当前数据选出的清晰起点，不是证明某个猎人永远最强。Steam 百分比是拥有者快照，不能当作单局成功率；Reality 的数字高于 Hell，也不能被解释成顺序留存。
普通 难度改变了什么
The first measured clear tier. Steam calls the achievement Normal while the in-game ladder commonly labels this tier Common; the old /normal URL is kept for search continuity.
Create a repeatable shot event.
Vintage Musket, Geminate Shot+, and Reload Speed or Fire Rate.
检查：If the gun is still waiting on long reloads, do not chase crit yet.
Turn uptime into more projectiles.
Quick Fire, Triple Shot, Bullet Attack, then a matching element relic.
检查：The route is working when ordinary fire produces several useful events per magazine.
Convert volume into a stable boss finish.
Critical Chance, Critical Damage, Emperor's Holy Sword, and reload support.
检查：Keep one reliable damage channel; do not add a second engine just because it is rare.
Boss 与清怪优先级
Use reload support and crit payoff once the target stays alive long enough for repeated first-shot windows. Keep firing discipline; a burst that spends half the fight reloading is not a boss plan.
Extra shots, fire rate, and a weapon that spreads pressure are the priority. If packs are the failure point, Bullet Attack and volley effects beat a greedy single-target card.
核心缺失时的补救
Keep the physical element, choose Fire Rate and Reload Speed, and use Demonhunter Crossbow or any reliable physical family.
不要：Do not hold empty slots for one exact skill while the current weapon has no uptime support.