12g BLANK [Henry Krank] Alarm Mine Trip Wire Security Device

The Henry Krank Alarm Mine is a compact, trip-wire operated security device manufactured by Henry Krank & Co., a UK-based supplier of shooting and outdoor equipment with over 150 years of history.

Designed to deter intruders and provide an audible warning, it detonates a 12-gauge blank cartridge when triggered, producing a loud bang (over 120 decibels) and flash to alert property owners or scare off trespassers. Ideal for securing remote areas like farms, workshops, garages, or gardens, it's commonly used by farmers, gamekeepers, and homeowners for perimeter protection against wildlife or unauthorized access.

Made in the UK, the device emphasizes simplicity and reliability, with no projectiles involved for safety, though it's age-restricted (18+) due to its use of blanks. Priced affordably, it's a popular entry-level option for non-lethal deterrence, often paired with blanks like Eley 12g shorts.

Key Specifications

• Dimensions and Weight: Compact unit weighing 0.096 kg (about 3.4 oz), suitable for discreet mounting.

 

• Mechanism: Trip-wire activated; vertical mounting on trees, posts, or frames using included screws.

 

• Compatibility: Uses 12-gauge short black powder blanks (e.g., Eley or similar); not compatible with live ammunition.

 

• Pack Contents: 1 x Alarm Mine unit, 1 x 3-meter (10 ft) trip wire, 2 x wood screws, 1 x safety pin with release, 1 x instruction sheet.

 

• Material: Durable metal construction for outdoor use; weather-resistant but recommended to check periodically.

 

• Safety Features: Includes a safety pin to prevent accidental firing; requires careful arming/disarming per instructions.

 

• Legal Restrictions: Age 18+ with ID verification; shipping limited to UK mainland (no Highlands/Islands without special arrangement); classify as a blank-firing device under local laws.

 

Performance and User Feedback

• Pros: Users praise its ease of setup, loud deterrent effect, and value for money, with forums like The Farming Forum recommending it as a "go-to" for workshop security.
• The device reliably triggers with minimal false alarms if installed correctly, and the bang is effective for scaring animals or intruders without harm. On retailer sites, it holds a perfect 100% rating based on available reviews.

 

• Cons: Some note the need for regular maintenance to prevent rust or residue from blanks, and the trip wire may require replacement in high-wind areas. Compatibility limited to specific blanks, with older straight-sided types potentially causing issues.
•  Reddit users describe Henry Krank as "very good if not a bit expensive" overall, though this product is budget-friendly.

 

• Use Case Example: Farmers use it for protecting outbuildings, with one forum post highlighting its role in alerting to "unwanted visitors."

 

Legal and Safety Considerations

Regulations: In the UK, buyers must be 18+ and provide ID; shipping is restricted to mainland UK. In the US, local laws vary—some states require permits for blank-firing devices. In Canada, devices using these blanks may be classified as prohibited if they can chamber live rounds. Always verify local regulations.

Safety: Treat as live ammunition—store securely, use proper firearms or devices, and avoid modifications. Eye/ear protection is mandatory due to the intense noise and flash.

Did you know we sell these blanks for £15.95 a box in store? We can do them cheaper in person!