Green’s Dictionary of Slang

firearms, weapons.

1905		Bulletin (Sydney) 27 July 36/2: ‘Th-thank y’u, my good man,’ sed ’e, lookin’ a bit funked an’ kinder shyin’ at the array o’ ironmongery stuck in our belts.
1933		J. Spenser Limey 139: Say, kid, you won’t need the ironmongery in here.
c.1950		K. Howard Small Time Crooks 82: She went downtown that very next morning to see a guy she knew in the business of selling ironmongery, and demanded a gun.