After grinding, a nut is screwed into the breech, and the barrel is taken to the proof house to be proved.
"Rides on Railways" by Samuel Sidney
A cast of the breech and screw now forms No.
"Sketches of the Natural History of Ceylon" by J. Emerson Tennent
The breech-screw should be taken out only by an armorer, and never in ordinary cleaning.
"Ordnance Instructions for the United States Navy." by Bureau of Ordnance, USN
This gun was a wrought-copper tube screwed into a chambered brass breech, bound with four iron hoops.
"Artillery Through the Ages" by Albert Manucy