▁M 1 C s ▁and ▁ 2 1 , 3 8 0 ▁M 1 D s ; ▁although ▁few ▁M 1 D s ▁were ▁completed ▁in ▁time ▁to ▁see ▁combat . ▁ ▁The ▁U . S . ▁Marine ▁Corps ▁adopted ▁the ▁M 1 C ▁as ▁their ▁official ▁sni per ▁rif le ▁in ▁ 1 9 5 1 . ▁This ▁US MC ▁ 1 9 5 2 ▁S ni per ' s ▁R if le ▁or ▁MC 5 2 ▁was ▁an ▁M 1 C ▁with ▁the ▁commercial ▁St ith ▁Bear ▁Cub ▁scope ▁manufact ured ▁by ▁the ▁K oll m orgen ▁Opt ical ▁Company ▁under ▁the ▁military ▁design ation : ▁T eles cop ic ▁S ight ▁- ▁Model ▁ 4 X D - US MC . ▁The ▁K oll m orgen ▁scope ▁with ▁a ▁slightly ▁modified ▁Griff in ▁& ▁How e ▁mount ▁was ▁designated ▁MC - 1 . ▁The ▁MC 5 2 ▁was ▁also ▁too ▁late ▁to ▁see ▁extensive ▁combat ▁in ▁Korea , ▁but ▁it ▁remained ▁in ▁Marine ▁Corps ▁invent ories ▁until ▁replaced ▁by ▁b olt - action ▁rif les ▁during ▁the ▁Vietnam ▁War . ▁The ▁U . S . ▁Navy ▁has ▁also ▁used ▁the ▁Gar and , ▁re ch am ber ed ▁for ▁the ▁ 7 . 6 2 × 5 1 mm ▁NAT O ▁round . ▁ ▁The ▁det ach able ▁M 2 ▁con ical ▁flash ▁h ider ▁adopted ▁ 2 5 ▁January ▁ 1 9 4 5 ▁sli pped ▁over ▁the ▁m uzz le ▁and ▁was ▁secured ▁in ▁place ▁by ▁the ▁bay