Key facts
- Official designation: fw3/25
- Internal measurement of 6ft (1.8m)
- Shape: circular
- Common name: Armco
- Proof against rifle fire
- For infantry using rifles and light automatics
- Usually found with three rifle loops and a low entrance
- Walls usually 12″ (30cms) thick and often shuttered in corrugated iron giving it a distinctive appearance
![](http://www.pillbox-study-group.org.uk/psgwordpress/wp-content/uploads/2013/01/forthenry24.jpg)
![](http://www.pillbox-study-group.org.uk/psgwordpress/wp-content/uploads/2013/01/forthenry23.jpg)
![](http://www.pillbox-study-group.org.uk/psgwordpress/wp-content/uploads/2013/01/forthenry22.jpg)
![](http://www.pillbox-study-group.org.uk/psgwordpress/wp-content/uploads/2013/01/forthenry21.jpg)
![](http://www.pillbox-study-group.org.uk/psgwordpress/wp-content/uploads/2012/12/Type-25-Armco.jpg)
Information obtained from pillbox typology part 4 in Loopholes journal of the PSG. With kind permission of Mike Osborne.