A quirky community local featuring two narrow front bar areas with several bar stools, leading to wider side and rear areas with smart seating, and odd low beam. Occasional karaoke and quiz nights, sports TV and pool table. Large garden at rear with marquee to shelter in. Ale usually from local Windsor & Eton Brewery. Food offering described as Italian street food. Unusual pub name refers to a breech loading artillery piece invented by Sir William Armstrong in 1859.