0 0 ▁car bine - length ▁M 1 ▁rif les ▁for ▁use ▁in ▁the ▁Pacific ▁the ater . ▁To ▁emphas ize ▁the ▁need ▁for ▁rapid ▁action , ▁he ▁requested ▁the ▁Or dn ance ▁arm ▁of ▁the ▁U . S . ▁ 6 th ▁Army ▁in ▁the ▁Philippines ▁to ▁make ▁up ▁ 1 5 0 ▁ 1 8 " ▁bar re led ▁M 1 ▁rif les ▁for ▁service ▁tri als , ▁sending ▁another ▁of ▁the ▁rif les ▁by ▁special ▁cou rier ▁to ▁U . S . ▁Army ▁Or dn ance ▁officials ▁at ▁Aber de en ▁as ▁a ▁demonstr ation ▁that ▁the ▁M 1 ▁could ▁be ▁easily ▁modified ▁to ▁the ▁new ▁configuration . ▁Although ▁the ▁T 2 6 ▁was ▁never ▁approved ▁for ▁production , ▁at ▁least ▁one ▁ 1 8 " ▁bar re led ▁M 1 ▁rif le ▁was ▁used ▁in ▁action ▁in ▁the ▁Philippines ▁by ▁tro op ers ▁in ▁the ▁ 5 0 3 rd ▁Par ach ute ▁Infantry ▁Regiment ▁( 5 0 3 rd ▁P IR ). ▁ ▁T 2 0 E 2 ▁ ▁Another ▁variant ▁that ▁never ▁saw ▁duty ▁was ▁the ▁T 2 0 E 2 . ▁It ▁was ▁an ▁experimental ▁gas - oper ated , ▁select ive ▁fire ▁rif le ▁with ▁a ▁slightly ▁longer ▁receiver ▁than ▁the ▁M 1 ▁and ▁modified ▁to ▁accept ▁ 2 0 - round ▁Brow ning ▁Autom atic ▁R if le ▁( B AR ) ▁mag az ines . ▁The ▁rif le ▁was ▁mach ined ▁and ▁t apped ▁on ▁the ▁left ▁side ▁of ▁the ▁receiver ▁for ▁a