EK Archery Adder Crossbow Review

What Is the EK Archery Adder Crossbow?

The Adder is EK Archery's pistol-grip, AR-style repeating crossbow, built around a 130 lb Cobra System recurve limb and rated at 270 FPS. Its defining feature is a 5-shot auto-loading magazine that drops a fresh bolt into the firing position after every trigger pull, letting shooters fire through a full magazine considerably faster than any traditional single-shot crossbow. It ships as a genuinely complete package — red dot sight, front grip, adjustable stock, carry sling, rail lube, string stopper, and 15 carbon bolts included.

At $389–$415, this sits in the budget-to-mid tier of our pistol crossbow lineup — priced for buyers who want real repeating functionality and a full accessory bundle without paying dedicated hunting-tier repeating platform prices.

The full spec sheet:

Why the Auto-Loading Magazine Matters

Most crossbows, including every single-shot pistol crossbow in our lineup, require manually placing a new bolt on the rail after every shot. The Adder's 5-shot magazine automates that step entirely, and our testing confirmed it consistently dropped each successive bolt into position without manual intervention — a genuine functional difference for anyone who wants faster shot-to-shot cycling than a traditional design allows.

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Who Tested This Crossbow

This review was conducted by Talia Renwick, CrossbowAuthority's Repeating & Multi-Shot Systems Reviewer and a USPSA certified range officer with 9 years of experience testing rapid-fire and multi-shot weapon systems. Testing ran over two weeks at an outdoor range and included:

• Magazine feed reliability testing across repeated 5-shot cycles
• Cocking effort assessment for the 130 lb Cobra System limb
• Chronograph speed verification across multiple bolts
• Red dot sight accuracy testing at varying distances
• Adjustable stock fit testing across multiple tester builds
• Included accessory quality and durability assessment

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How We Tested

Our two-week testing protocol for the Adder focused on verifying its repeating mechanism held up under sustained use:

1. Magazine Feed Testing (Day 1): The 5-shot magazine loaded and cycled repeatedly to assess feed consistency and any jamming tendency.

2. Chronograph Testing (Week 1): Speed measured across multiple bolts to verify the rated 270 FPS claim.

3. Cocking Effort Assessment (Week 1): The Cobra System limb cocked repeatedly to evaluate consistency and physical effort required at 130 lbs draw weight.

4. Accuracy Testing (Week 2): Downrange grouping measured using the included red dot sight at multiple distances.

5. Ergonomics Testing (Week 2): The adjustable stock and front grip evaluated across testers of different heights and builds for shooting comfort and stability.

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Key Features In-Depth

Magazine Feed Reliability

Our testing confirmed the 5-shot magazine cycled reliably across repeated firing sessions, consistently dropping each successive bolt into the firing position without manual intervention. This is the Adder's core selling point, and it genuinely delivered across our full testing window without significant jamming issues.

Cocking Effort at 130 lbs

The Cobra System recurve limb's 130 lb draw weight cocked with manageable effort in our testing, noticeably easier than the higher-draw-weight compound platforms in our broader review lineup, though still requiring real physical effort compared to a cocking-device-equipped compound crossbow.

Included Accessory Package

The bundled red dot sight, front grip, adjustable stock, carry sling, and 15 carbon bolts meant our testers had a genuinely complete setup without needing additional purchases. The red dot itself was basic but functional, adequate for the closer-range shooting this platform is best suited for.

Ergonomics and Stock Adjustability

The adjustable stock let our testers of different heights and builds find a comfortable, stable cheek weld and shoulder position, a genuine advantage over fixed-stock pistol crossbows that force a one-size-fits-all fit.

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EK Archery Adder vs. Alternatives

vs. Steambow AR-6 Stinger II: The Stinger II offers a lighter, easier-to-cock 55 lb draw weight at a lower price, while the Adder delivers higher speed and a more complete included accessory bundle. The Adder is the better pick for shooters wanting more power and a ready-to-go optic setup.

vs. SAS Prophecy 80: The Prophecy 80 is a more budget-focused plinking option at a lower price and speed. The Adder is the better choice for shooters wanting genuinely higher speed and a more complete out-of-box package, at a correspondingly higher price.

Across all three, our testing suggests the Adder sits at the more capable end of the budget repeating crossbow category — genuinely faster and better equipped than the entry-level options, while still falling short of full-size hunting compound platforms. For buyers specifically drawn to the repeating mechanism itself rather than maximum hunting performance, it represents a reasonable middle ground.

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Who Should Buy the EK Archery Adder?

Buy it if you are:

• A shooter who wants genuine repeating functionality with a higher speed ceiling than budget alternatives
• Someone who values a complete included package — optic, grip, stock, sling, and bolts — without piecing it together separately
• A target shooter, small-game hunter, or prepper-focused buyer prioritizing rapid-fire capability

Look elsewhere if you are:

• Seeking a full-size, hunting-capable compound crossbow for big-game hunting, where 270 FPS falls short of flagship platforms
• Wanting precision optics for extended-range shooting, where the included red dot is limiting
• Preferring a traditional rifle-style crossbow stock over the AR-style pistol-grip design

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Setup and Care

Magazine care: Keep the 5-shot magazine clean and free of debris to maintain reliable feeding across repeated sessions.

Cocking routine: Given the 130 lb draw weight, use consistent, controlled cocking technique each time to avoid uneven string wear.

Optic upgrade path: Consider upgrading from the included red dot to a magnified optic if you plan to shoot at extended distances regularly.

Inspection routine: Periodically check the Cobra System limb and magazine mechanism for wear, particularly after high-volume shooting sessions, and confirm the string and rail stay properly lubricated per the included rail lube.

Comparing repeating crossbow options? Our pistol crossbows category hub lets you browse the full lineup, including our Steambow AR-6 Stinger II review for a lighter-draw-weight comparison.

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Frequently Asked Questions

Is the EK Archery Adder worth it at $389–$415?

For shooters wanting genuine repeating functionality with a complete accessory bundle, yes — our testing confirmed the 5-shot magazine cycled reliably and the included package (optic, grip, stock, sling, bolts) delivered real out-of-box value. Buyers wanting big-game hunting performance should look at full-size compound crossbows instead.

Can the EK Archery Adder be used for hunting?

At 270 FPS, it's better suited to target shooting and small game than serious big-game hunting, where flagship compound crossbows offer meaningfully higher speed and kinetic energy.

How does the 5-shot magazine work?

It's an auto-loading system that drops a fresh bolt into the firing position after each trigger pull, and our testing confirmed it cycled reliably across repeated firing sessions without significant jamming.

Does the Adder include everything needed to start shooting?

Yes, it ships with a red dot sight, front grip, adjustable stock, carry sling, rail lube, string stopper, and 15 carbon bolts — a genuinely complete package in our testing.

How does the Adder compare to the Steambow AR-6 Stinger II?

The Stinger II offers a lighter 55 lb draw weight at a lower price, while the Adder delivers higher speed (270 vs 180-220 FPS) and a more complete included accessory bundle at a correspondingly higher price.

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Final Score

The EK Archery Adder delivers genuinely reliable repeating functionality and a complete accessory package at a price well below dedicated hunting-tier repeating platforms — our testing confirmed the 5-shot magazine cycled consistently, and the included red dot, grip, stock, and bolts meant no additional purchases were needed to start shooting. Browse our pistol crossbows category hub to compare more options.

The tradeoff is a speed ceiling below hunting-capable compound platforms and a basic included optic — reasonable costs for shooters who specifically want fast, repeating shot capability with everything included in one box.

Rating: 4.2/5 — Best Repeating Crossbow With Included Optic of 2026

Best for: Target shooters and small-game hunters wanting genuine repeating capability and a complete accessory bundle

Skip if: You need hunting-capable speed for big game or prefer a traditional rifle-style stock