ਮੰਗਲਾਚਰਨ
"The King-Army Churner" - Guru Gobind Singh's Name for the Gun

ਜਗਤੀਸਣੀ ਪਦਾਦਿ ਬਖਾਨੋ ॥ ਅੰਤਿ ਸਬਦ ਮਥਣੀ ਤਿਹ ਠਾਨੋ ॥
First say 'the Army of the Kings' [Jagat-isa-ni], then attach the word 'the Churner [Mathni].
ਸਕਲ ਤੁਪਕ ਕੇ ਨਾਮ ਪਛਾਨਹੁ ॥ ਯਾ ਮੈ ਭੇਦ ਰਤੀ ਨ ਪ੍ਰਮਾਨਹੁ ॥710॥
Understand all the names of the Gun, don't doubt this even in the slightest.
- Dasam Guru Granth Sahib, Shastarnamala
Here Guru Gobind Singh names the Gun as the 'King-Army Churner', analogizing the long wood shape of a churner [madani] to the long barrel of a gun - both churning, taking two substances and extracting their essence. The Churner extracts butter from milk, and a Gun extracts blood from the King's Army.
ਜਗਤੀਸਣੀ = ਜਗਤ (World) ਈਸ (Rulers/Kings) ਣੀ (Army of)
ਮਥਣੀ = Churner