▁of ▁the ▁purch aser . ▁As ▁the ▁fire arm ▁gained ▁asc end ancy ▁on ▁the ▁battle field , ▁this ▁lack ▁of ▁standard isation ▁led ▁to ▁increasing ▁difficulties ▁in ▁the ▁supply ▁of ▁am mun ition ▁and ▁repair ▁materials . ▁To ▁address ▁these ▁difficulties , ▁arm ies ▁began ▁to ▁adopt ▁standard ised ▁" pattern s ". ▁A ▁military ▁service ▁selected ▁a ▁" pattern ▁mus ket " ▁to ▁be ▁stored ▁in ▁a ▁" pattern ▁room ". ▁There ▁it ▁served ▁as ▁a ▁reference ▁for ▁arms ▁mak ers , ▁who ▁could ▁make ▁compar isons ▁and ▁take ▁measurements ▁to ▁ensure ▁that ▁their ▁products ▁matched ▁the ▁standard . ▁ ▁Str ess - b ear ing ▁parts ▁of ▁the ▁Brown ▁B ess , ▁such ▁as ▁the ▁bar rel , ▁lock work , ▁and ▁s ling - sw iv els , ▁were ▁custom arily ▁made ▁of ▁iron , ▁while ▁other ▁furn iture ▁pieces ▁such ▁as ▁the ▁but t ▁plate , ▁trigger ▁guard ▁and ▁ram rod ▁pipe ▁were ▁found ▁in ▁both ▁iron ▁and ▁br ass . ▁It ▁we ighed ▁around ▁ ▁and ▁it ▁could ▁be ▁fitted ▁with ▁a ▁ 1 7 - inch ▁( 4 3 2   mm ) ▁tri angular ▁cross - section ▁bay on et . ▁The ▁weapon ▁did ▁not ▁have ▁s ights , ▁although ▁the ▁bay on et ▁lug ▁double d ▁as ▁a ▁cru de ▁front ▁sight . ▁ ▁The ▁earliest ▁models ▁had ▁iron ▁f itt ings , ▁but ▁these ▁were ▁replaced ▁by ▁br ass ▁in ▁models ▁built ▁after ▁ 1 7 3 6 . ▁Wood en ▁sc our