▁version ▁of ▁this ▁design , ▁mounted ▁in ▁single ▁gun ▁tur rets ▁in ▁. ▁ ▁The ▁ 1 2 - inch / 4 5 ▁cal ib re ▁Can on ▁de ▁ 3 0 5 mm / 4 5 ▁Mod èle ▁ 1 8 9 3 ▁gun ▁was ▁an ▁experimental ▁longer ▁bar rel ▁version ▁of ▁this ▁design , ▁mounted ▁in ▁single ▁gun ▁tur rets ▁in ▁J aur ég ui berry ▁and ▁B ouv et . ▁ ▁World ▁War ▁I ▁railway ▁gun ▁During ▁World ▁War ▁I ▁sur plus ▁Mod èle ▁ 1 8 9 3 / 1 8 9 6 ▁guns ▁were ▁mounted ▁on ▁both ▁rot ating ▁centre - p int le , ▁cr ad le ▁re co il , ▁and ▁sl iding - car riage ▁mount ings ▁on ▁railway ▁carri ages ▁to ▁provide ▁mobile ▁fire power ▁on ▁the ▁Western ▁Front . ▁They ▁fired ▁shell s ▁we igh ing ▁from ▁ ▁to ▁a ▁maximum ▁range ▁of ▁. ▁The ▁rail road ▁mount s ▁had ▁a ▁maximum ▁elev ation ▁of ▁ 4 0 ° ▁which ▁accounts ▁for ▁the ▁extra ▁range ▁over ▁the ▁naval ▁guns . ▁ ▁Am mun ition ▁▁ ▁A PC ▁( Ar mor ▁Pier cing ▁C apped ) ▁- ▁▁ ▁CI ▁( Cast ▁iron ) ▁- ▁▁ ▁S AP C ▁( S emi - Ar mor ▁Pier cing ▁C apped ) ▁- ▁ ▁See ▁also ▁ ▁We ap ons ▁of ▁compar able ▁role , ▁performance ▁and ▁era ▁ ▁Arm strong ▁Whit worth ▁ 1 2 ▁in ch ▁/ 4 0 ▁naval ▁gun ▁British ▁equivalent ▁naval ▁gun