Killer instinct Fierce 405 – Crossbow Review

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We got our hands on another Killer Instinct crossbow. This time it’s the Killer Instinct Fierce 405, a budget friendly crossbow. So now that we’ve got our hands on the Killer Instinct Fierce 405, we can finally review it.

The killer instinct Fierce 405 is seems to be the perfect crossbow for beginners and seasoned hunters. The Fierce 405 is a budget friendly yet powerful crossbow. The Fierce 405 is very easy to assemble and lightweight.

The pro package includes 1 Fierce 405 crossbow, 1 illuminated scope, 1 rope cocking device, string suppressors, 3-bolt quiver, 3 bolts with field tips, and 1 stick of rail lube. Everything you need to start hunting!

Killer Instinct Fierce 405 – Crossbow Specs

Killer Instinct Fierce 405 Crossbow
Killer Instinct Fierce 405 Crossbow Package. The Fierce 405 is The Best Crossbow for Hunting Whether Your A Seasoned Veteran Or Training Your Kids for Their First Time Out.
405 FPS
Width Axle-to-Axle:
14.5” / 17.75”
32.5" - 33”
6.2 lbs. (w/o acc.)
Power Stroke:
Draw weight:
200 lbs.
Buy Now:
Killer Instinct Fierce 405 Crossbow
Killer Instinct Fierce 405 Crossbow Package. The Fierce 405 is The Best Crossbow for Hunting Whether Your A Seasoned Veteran Or Training Your Kids for Their First Time Out.
405 FPS
Width Axle-to-Axle:
14.5” / 17.75”
32.5" - 33”
6.2 lbs. (w/o acc.)
Power Stroke:
Draw weight:
200 lbs.
Buy Now:

First Impressions

The Killer Instinct Fierce 405 looks to be the perfect crossbow for beginners and seasoned hunters looking for a budget friendly yet powerful crossbow. The Fierce 405 should be reaching

speeds of over 400 fps and is very lightweight at just 6.7 lbs.

The Killer Instinct Fierce 405 is fairly easy to assemble. We made sure to use the rail lube on the strings and the rail.


Ultra-light composite stock is comfortable and easy-to-manoeuvre.

Custom rubber shock absorbers reduce noise and vibration for increased stealth and performance.

Killer Instinct Fierce 405 Stock Photo

Multi-position butt-pad and the X-LOK adjustable foregrip helps provide customized fit for increased comfort, accuracy and multiple holding options.


Killer Instinct equipped the Fierce 405 with a basic scope. The Killer Instinct Lumix™ scope 4 X 32 has multiple reticles which makes it easy to shoot at up to 80 yard distances.

This scope can also be used in low light settings because of the rheostat brightness illumination in red or blue.

The Lumix scope is all set with nitrogen purging to keep it water, shock, and fog-proof. It’s got a slick, slim design, perfect for modern crossbows that shoot at speeds of 300+ FPS.

Now, for beginners, this scope is okay, but we’ve noticed it’s more on the basic side. Clarity and sight aren’t always top-notch, especially on cloudy days.

If you’re aiming for spot-on clarity and sight, we’d recommend checking out the Truglo Crossbow Scope 4×32 IR with weaver-style scope rings. It’s fully coated lenses provide maximum brightness and still keeps that handy 4×32 compactness. This Truglo scope is nitrogen purged too, and it’s got a sleek non-reflective matte finish to boot.

TRUGLO 4x32mm Compact Crossbow Scope with Scope Rings Included| Illuminated BDC / Rangefinder, Black
  • DUAL COLOR ILLUMINATED RETICLE - The 4x32 MM Compact Crossbow Scope for Archery Hunting features rheostat-controlled adjustable brightness; The reticle can be used without illumination; Battery included (TG988C, 3V-CR2032) with illuminated model
  • RUGGED DURABILITY - This 4x32 mm Crossbow Scope from TruGlo has a one-piece aircraft-grade aluminum tube construction that ensures long-term use; Durable, scratch-resistant, non-reflective matte finish provides perfect concealment
  • ULTIMATE QUALITY - The TruGlo Archery Scope features generous 4 inches eye relief; This crossbow accessory is water-resistant and shock-resistant to ensure your hunting will be successful in any conditions
  • SUPERIOR PERFORMANCE - The 4x32mm compact scope has a range finder/bolt drop-compensating BDC reticle; Durable leaf spring fingertip adjustments for windage and elevation; Elastic protective lens caps are included
  • PERFECT VISIBILITY - This TruGlo scope is fog-proof due to the nitrogen gas filling; Fully-coated lenses provide maximum brightness, clarity, and contrast; The package includes weaver-style scope rings


Killer Instinct includes a rope cocking device with the Fierce 405. With a draw weight of 2 pounds, it can be quite the task for some people. Killer Instinct offers a silent crank draw that can be easily detached when needed.

If you’re looking for an upgrade the Killer Instinct Compact DSC (Dead Silent Crank) wide sled operates in complete silence and features a compact design. Due to the crank’s compact and lightweight nature compared to the included rope cocking device for the Killer Instinct Fierce 405, it is remarkably easy to attach and detach. All in all it’s worth the upgrade.

Killer Instinct Compact DSC Dead Silent Crank (Wide Sled)
  • 100% Silent: The Dead Silent Crank has a 100% silent operation
  • Construction: Compact body that rapidly attaches and detaches
  • Speedy: Crank rapidly attaches and detaches in seconds
  • Safety: Operates safely and silently to cock your crossbow
  • Compatibility: This Wide Sled model is compatible with Lethal 405, Fierce 405, BC 370, Boss 405, Burner 415, Ripper 425, Speed 425 and HERO 380 only

Trigger and Safety Features

The Fierce 405 crossbow comes with a crisp 3.5 pound trigger automatic safety switch. When you cock the Fierce 405 it automatically goes on safety. Nowadays most crossbows will have an automatic safety switch, reflecting the advancements in modern crossbow technology.

Arrows and Quiver

Includes three Hypr Lite 20-inch crossbow bolts. These bolts weigh 370 grains and are equipped with half-moon nocks.

Comes with a basic 5 arrow quiver. It does the job and at this price point a quiver included is a bonus.


Killer Instinct Fierce 405 Range Test

Before I give the Killer Instinct Fierce 405 a thorough test spin, I want to point out that even though this crossbow comes at an affordable price, Killer Instinct  advertises it as having a “dead silent” kit. So, I expect it to be a quiet shooter.

The Fierce 405 can send arrows flying at a whopping 405 feet per second, using the included 20-inch HYPR Lite arrows. In the package, you’ll find a total of 3 carbon HYPR arrows with field tips. They’re 20 inches long and have a combined weight of 370 grains, including the 100-grain field tips.

This crossbow is equipped with a standard trigger that has a 3.5-pound pull. It comes with built-in safety features like an anti-dry fire mechanism and an automatic safety switch. Considering the budget-friendly price of this crossbow, the trigger feels surprisingly smooth with minimal creep.

As I mentioned in the scope section, I swapped out the 4×32 Basic illuminated scope for the Truglo Crossbow Scope 4×32 IR with Rings. With this scope, we have a perfectly illuminated scope that remains clear in cloudy weather.

Sighting in the illuminated scope from the Killer Instinct is pretty straightforward. Once you’ve zeroed it in at 20 yards, the other aiming points should also be on target.

Cocking the Fierce 405 with the provided rope cocker should bring the draw weight down to around 100 pounds. For experienced crossbow shooters, this should be a breeze, but it might take some getting used to for newbie crossbow hunters. If you have any shoulder, back, or neck issues, it’s worth checking out the “Dead Silent Crank” that Killer Instinct offers for this crossbow.

All that remains is the speed and accuracy assessment, and for this, I chose to utilize only the three HYPR arrows that came with the package. After calibrating the Basic illuminated scope, achieving bullseyes at a distance of 60 yards proved to be a straightforward endeavor. Here’s a valuable tip: refrain from repeatedly targeting the same spot, as you’re bound to inadvertently split arrows like a modern-day Robin Hood! Attaining 1-inch groupings with this crossbow presents a manageable challenge.

When I put the Fierce 405 to the test with the HYPR bolts over a chronograph, the results were impressive. All three shots clocked in at over 400 feet per second! Specifically, we’re looking at 401, 403, and 403 feet per second!

Recommended Accessories

Arrows and Broadheads

As this package only includes three Hypr Lite 20-inch crossbow bolts, we highly recommend getting an extra set of bolts. The Hyper Lite bolts are great value for the money, a six pack comes very cheap.

Using good broadheads for hunting is a must. You don’t want to let a badly injured animal runoff. Therefor it’very important that hunters employ razor-sharp broadheads at the end of their arrows.

As for the broadheads, in our test we used the G5 Outdoors Montec fixed blade broadheads. We’ve also covered them in our best buy guide and their performance is great! They’re very accurate and have great penetration.

G5 Outdoors Montec Crossbow Broadheads (3-Pack), 100 Grain
  • This High Speed Crossbow Model is ideal for all crossbows. With no components needed to replace or maintain, it's easy and simply to use.
  • Due to the strong tapered blade design's and angle it allows the Montec to be easily re-sharpened.
  • Available in 100 and 125 Grains with a 1" to 1 1/8" Cutting Diameter
  • 3 Broadheads Per Pack
  • One-Piece Metal Injection Molding Construction

Storage and Transportation

Unfortunately the Fierce 405 does not fit the narrow slayer crossbow case. It does fit the 22×36 slayer case. This case is a perfect fit for the fierce 405.

The slayer crossbow case includes 3 external and 1 internal compartment for all accessories you might need to bring with you on a trip. Comes with a top carry handle and an adjustable shoulder strap.

Killer Instinct Slayer Crossbow Case with Rip Stop Technology. This Portable Zippered Crossbow Case fits Crossbows Up To 22 x 36 Inches. Has 4 Padded Pockets for Your Gear.
  • PROTECT YOUR CROSSBOW: Keep your crossbow safe from water, bumps, and drops during storage and transportation
  • DURABLE DESIGN: Woven from long-lasting ripstop fabric reinforced trim at the corners for rugged durability
  • INTERIOR PADDING: Padded interior provides extra layers of protection from shifting
  • PLENTY OF POCKETS: 3 internals and 1 external storage compartment let you keep scopes, sights, bolts, quivers, and more easily accessible
  • HANDS-FREE CARRY: Top carry handle and adjustable shoulder strap provides comfortable and convenient carrying

Final Verdict

Killer Instinct Fierce 405 Crossbow Review

Bryan Taylor

Sound and Vibrations


The Killer Instinct Fierce 405 is an excellent choice for beginners, newcomers, and even budget-conscious experienced hunters. However, there are a few aspects of the Killer Instinct Fierce 405 that we find less than ideal.

One noticeable issue is the quality of the string suppressors, which may require replacement after some use. Additionally, the Killer Instinct Lumix™ scope 4 X 32, while serviceable as a basic scope, lacks clarity and sight when the weather is less than clear. This can be a bit frustrating. During our tests with the basic scope, we achieved the advertised accuracy of up to 80 feet, but beyond 85+ feet, it begins to lose accuracy.

Despite these drawbacks, the crossbow performs admirably at its price point. It shoots accurately and quietly, with an easy-to-pull cocking mechanism. Its lightweight design and adjustable foregrip, a rarity among beginner-friendly crossbows, make it a standout choice. The Killer Instinct Fierce 405 is a high-quality crossbow suitable for newcomers and experienced hunters alike, and it unquestionably delivers great value for its price.

All in all, the Killer Instinct Fierce 405 is a very good investment!


What we like

  • Lightweight
  • Adjustable foregrip
  • 405 fps
  • Cheap
  • Beginner friendly
  • Crank cocking optional

What we don’t like

  • The string suppressors are not the best quality
  • Limited scope clarity
  • Reduced accuracy beyond 85+ feet

Photo of author
Bryan Taylor is the co-founder and CEO of He’s a hunter and fisherman who loves the outdoors. He wants to share his adventures, knowledge, experience, and expertise with you through this blog.

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