I beg to differ...
From Keyword MW on aol(Merriam Webster's dictionary)
Emphasis on entry 3
Main Entry: breech
Pronunciation: 'brEch
Function: noun
Etymology: Middle English, breeches, from Old English brEc, plural of brOc leg covering; akin to Old High German bruoh breeches, Latin brAca pants
Date: before 12th century
1 : pl /'bri-ch&z also 'brE-/ a : short pants covering the hips and thighs and fitting snugly at the lower edges at or just below the knee b : PANTS
2 a : the hind end of the body : BUTTOCKS b : BREECH PRESENTATION; also : a fetus that is presented breech first
3 : the part of a firearm at the rear of the barrel
While paintball markers are not firearms, it is to the same effect.
From Keyword MW on aol(Merriam Webster's dictionary)
Emphasis on entry 3
Main Entry: breech
Pronunciation: 'brEch
Function: noun
Etymology: Middle English, breeches, from Old English brEc, plural of brOc leg covering; akin to Old High German bruoh breeches, Latin brAca pants
Date: before 12th century
1 : pl /'bri-ch&z also 'brE-/ a : short pants covering the hips and thighs and fitting snugly at the lower edges at or just below the knee b : PANTS
2 a : the hind end of the body : BUTTOCKS b : BREECH PRESENTATION; also : a fetus that is presented breech first
3 : the part of a firearm at the rear of the barrel
While paintball markers are not firearms, it is to the same effect.

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