- Power ▁self - loading ▁p istol ▁of ▁ 1 9 3 5 , ▁but ▁scale d ▁up ▁significantly . ▁Where as ▁the ▁Hi - Power ▁used ▁the ▁ 9 ▁mm ▁Para ▁cart ridge , ▁the ▁NA AC O ▁Brig ad ier ▁used ▁a ▁new ▁long - case ▁. 4 5 " ▁round ▁of ▁much ▁greater ▁power ▁than ▁the ▁then - standard ▁. 4 5 ▁A CP . ▁With ▁a ▁standard ▁ ▁bullet , ▁the ▁. 4 5 ▁NA AC O ▁cart ridge ▁could ▁produce ▁m uzz le ▁veloc ities ▁of ▁up ▁to ▁, ▁or ▁almost ▁twice ▁as ▁fast ▁as ▁the ▁. 4 5 ▁A CP . ▁In ▁order ▁to ▁keep ▁weight ▁down , ▁the ▁p istol ▁used ▁an ▁al umin ium ▁slide , ▁but ▁still ▁we ighed ▁more ▁than ▁four ▁pounds , ▁un loaded . ▁Its ▁box ▁magazine ▁could ▁carry ▁eight ▁r ounds ▁of ▁am mun ition . ▁A ▁remov able ▁trigger ▁module ▁allowed ▁for ▁a ▁fully ▁automatic ▁configuration , ▁complete ▁with ▁an ▁attach able ▁but t - stock . ▁This ▁would ▁produce ▁a ▁sub - machine ▁gun ▁configuration ▁called ▁the ▁B ore alis ▁( ne ver ▁constructed ). ▁Gun sm ith ▁Robert ▁H erman ▁and ▁Design er ▁Russell ▁S uther land ▁spent ▁a ▁year ▁developing ▁the ▁prototype . ▁ ▁Col lapse ▁and ▁after math ▁In ▁the ▁end , ▁the ▁Brig ad ier ▁project ▁fell ▁victim ▁to ▁NAT O ▁standard ization , ▁and ▁the ▁company ▁fol ded ▁in ▁ 1 9 6 2 . ▁Only ▁one ▁prototype ▁was ▁built , ▁and ▁the