Back to top
No. 4 Mk I
Booby Trap
Hardware available
The No. 4 Mk I is an obsolete pull switch, copied by Yugoslavia as the UDP-1. The assembly incorporates a spring-loaded striker running axially through a tubular brass body. The ball-shaped end of the striker is retained by the cupped ends of a U-shaped clip within the fuze body. The assembly is typically fitted with a percussion-cap detonator. The fuze is armed through the removal of a safety pin, and initiated using a tripwire attached to the...
More information available for No. 4 Mk I
Backed by subject matter experts and proprietary AI tools, METIS, our advanced OSINT system, delivers verified, timely, and reliable intelligence on conflict, post-conflict, and instability scenarios.
- Data is collected in multiple languages such as English, Arabic, Spanish, French, Russian, Ukrainian, Burmese.
- Thousands of highly-detailed technical records including munitions, platforms and CBRN agents curated by our subject matter experts.
- Heatmaps and charts which enable district, country, cross border and regional analysis.
- Search events by keywords, categories, locations, munition or platform designations and CBRN threat type.