Killer Instinct Crossbow Parts & Replacement Components

Parts you're most likely to need, roughly in order of frequency:

• Strings & cables — the top wear item; stretch and fray over time (see our dedicated strings page).
• Dampeners, limb/string dampers, and string stops — rubber components that quiet the shot and wear or fall out.
• Rail/flight groove and serving care items — rail lube and serving thread.
• Cocking hardware — rope cocker, or a DSC crank and its handle/hardware.
• Nocks, field points, and quiver hardware for your bolts.
• Screws, bolts, and mounting hardware for the scope rail, stock, and foot stirrup.
• Major components — limbs and trigger assemblies (safety-critical; see below).

Stock the small, cheap items (dampeners, hardware, spare nocks) in your kit so a minor issue never ends a hunt. See more on our parts and accessories pages.

Killer Instinct built many platforms over the years, and parts rarely cross between them. Before ordering:

• Identify your exact model and year — e.g. Fierce 405, Fatal-X, Tempr-X, Vital-X 430, Logix 435 — since limbs, cams, strings, and triggers differ.
• String/cable lengths are cut per model; crank housings are molded per stock; dampener locations vary.
• Universal-ish items (rail lube, string wax, generic hardware) are fine across models, but anything structural must match.

Check the OEM part number or your owner's manual, and contact Killer Instinct support for major components. Accessories and parts differ by model — never assume a part fits another platform.

Know your limits — some jobs are safe at home, others aren't:

• DIY-friendly: replacing dampeners and string stops, swapping nocks/points, tightening rail and stock hardware, waxing the string, applying rail lube, mounting a scope.
• Press or pro recommended: replacing strings and cables (most models need a crossbow press), and any limb work.
• Pro / factory only: trigger assembly service and anything affecting the fire-control or anti-dry-fire system. These are safety-critical — don't improvise.

If a repair affects how the bow holds or releases energy, and you're not fully sure, send it to a pro shop or Killer Instinct service. A cheap part is never worth an injury.

Regular checks catch problems before they become failures:

• Before each outing, inspect the string and serving, check that dampeners are seated, and confirm rail hardware and scope screws are snug.
• Wax the string every several sessions and lube the rail to slow serving wear.
• Verify the anti-dry-fire and safety engage correctly — never bypass them.
• Keep a small field kit: hex keys, spare nocks and points, string wax, and a dampener or two.
• Log shot counts so you know when strings and high-wear parts are due.

Fresh parts keep your speed and zero consistent, which protects your scope calibration and gets the most from your bolts.

While you're servicing the bow, consider:

• Strings and cables — the most common part to refresh.
• DSC Dead Silent Crank — a cocking upgrade if your model supports it.
• Cases — protect the bow so parts last longer between replacements.

Deciding whether to repair or upgrade the whole bow? See our best Killer Instinct crossbow guide and full reviews.