▁" pro hib ited ▁bore " ▁or ▁" P B " ▁in ▁Pakistan ). ▁These ▁A K - pattern ▁weapons ▁are ▁usually ▁considered ▁inferior ▁due ▁to ▁incons istent ▁gun sm ith ing ▁of ▁weapons ▁chamber ed ▁or ▁converted ▁for ▁this ▁cart ridge ▁and ▁lack ▁of ▁quality ▁control ▁of ▁the ▁am mun ition . ▁It ▁is ▁sometimes ▁used ▁by ▁private ▁security ▁companies . ▁The ▁usage ▁of ▁ 7 . 9 2   mm ▁bul lets ▁in ▁ 7 . 6 2   mm ▁bar rel s ▁without ▁re bor ing ▁is ▁not ▁considered ▁to ▁be ▁a ▁safe ▁practice . ▁ ▁See ▁also ▁▁ 8 ▁mm ▁cal iber ▁ ▁Cal z ada ▁Bay o ▁C B - 5 7 ▁ ▁List ▁of ▁rif le ▁cart rid ges ▁ ▁Table ▁of ▁hand gun ▁and ▁rif le ▁cart rid ges ▁ ▁References ▁ ▁Further ▁reading ▁ ▁Kap ell , ▁Dr . ▁Di eter , ▁Die ▁deutsche ▁Kurz pat r one ▁ 7 , 9 2 × 3 3 , ▁Books ▁on ▁Dem and ▁GmbH , ▁N order sted t ▁Germany , ▁ 2 0 0 7 ▁ ▁Hand rich , ▁Hans - Di eter , ▁St urm ge wehr ! ▁From ▁Fire power ▁to ▁St rik ing ▁Power , ▁Collect or ▁Gra de ▁Publications ▁Inc ., ▁Cob ourg , ▁Canada , ▁ 2 0 0 4 ▁ ▁* ▁Category : P istol ▁and ▁rif le ▁cart rid ges ▁Category : Mil it ary ▁cart rid ges ▁Category : We ap ons ▁and ▁am mun ition ▁introduced ▁in