Out of F. de Haas' book - 71/84, most Mausers are 12 TPI V threads, thread dia. varies -- 71/84 =.987 -- 88 Comission =.986 -- 89 Belgium =.995 -- 91 Arg. =.985 -- 93 to 96 =.980 -- 98 =1.10 -- 24 Yugo.=1.10 -- G33-40 =.980 -- 98 Siamese =.990.

Thread lengths vary but you can see which "other" barrels could be adapted. FWIW --- John