▁scope ▁mount , ▁and ▁included ▁the ▁same ▁hardware ▁for ▁mount ing ▁a ▁gr en ade ▁launch er ▁as ▁the ▁M 1 . ▁The ▁b olt ▁had ▁a ▁hold ▁open ▁device ▁on ▁the ▁rear ▁receiver ▁bridge , ▁as ▁well ▁as ▁a ▁fire ▁selector ▁similar ▁to ▁the ▁M 1 4 . ▁Full ▁automatic ▁fire ▁was ▁achieved ▁by ▁a ▁conne ctor ▁assembly ▁which ▁was ▁actu ated ▁by ▁the ▁operating ▁rod ▁handle . ▁This , ▁in ▁turn , ▁actu ated ▁a ▁se ar ▁release ▁or ▁trip ▁which , ▁with ▁the ▁trigger ▁held ▁to ▁the ▁rear , ▁dis eng aged ▁the ▁se ar ▁from ▁the ▁ham mer ▁lug s ▁immediately ▁after ▁the ▁b olt ▁was ▁locked . ▁In ▁automatic ▁firing , ▁the ▁cy clic ▁rate ▁of ▁fire ▁was ▁ 7 0 0 ▁r pm . ▁When ▁the ▁conne ctor ▁assembly ▁was ▁dis eng aged , ▁the ▁rif le ▁could ▁only ▁be ▁fired ▁semi - autom atically ▁and ▁function ed ▁in ▁a ▁manner ▁similar ▁to ▁the ▁M 1 ▁rif le . ▁The ▁T 2 0 ▁had ▁an ▁overall ▁length ▁of ▁ 4 8 ▁ 1 / 4 ", ▁a ▁bar rel ▁length ▁of ▁ 2 4 ", ▁and ▁we ighed ▁ 9 . 6 1   l bs . ▁without ▁access ories ▁and ▁ 1 2 . 5   l bs . ▁with ▁b ip od ▁and ▁empty ▁magazine . ▁It ▁was ▁designated ▁as ▁limited ▁proc ure ment ▁in ▁May , ▁ 1 9 4 5 . ▁Due ▁to ▁the ▁c ess ation ▁of ▁host ilities ▁with ▁Japan ,