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Tubing sizes for improvised firearm barrels from .22 Rimfire to 12 gauge shotgun. Seamless Mechanical Tube (SMT)/Seamless Hydraulic Tube (SHT)

            Calibre

Tube size required (mm)

       Bore dia. (mm)

 

 

 

         .22 Rimfire

       9.53 x 2.03 SMT

               5.47

 

 

 

 

       9.52 x 2.03 SHT

               5.46

 

 

 

         .25 ACP

      12.70 x  3.25 SMT

               6.20

 

 

 

         .32 ACP

      14.29 x 3.25 SMT

               7.79

 

 

 

         .38/.357

   15.88 x 3.25 SMT/SHT

               9.38

 

 

 

 

      19.05 x 4.88 SMT

               9.29

 

 

 

          9mm/.380

      14.29 x 2.64 SMT

               9.01

 

 

 

 

      14.00 x 2.50 SHT

               9.00

 

 

 

 

      15.00 x 3.00 SHT

              9.00

 

 

 

         .44/.410

      20.64 x 4.88 SMT

            10.88

 

 

 

 

      19.05 x 4.06 SMT

            10.93

 

 

 

        .45 ACP

      17.46 x 2.95 SHT

            11.56

 

 

 

        12 Gauge

      26.99 x 4.06 SMT

            18.87

 

 

 

 

      28.58 x 4.06 SMT

            20.46

 

 

 

 

      28.00 x 4.00 SHT

           20.00

 

 

 

 

     30.00 x 5.00 SHT

           20.00

All the tube sizes listed here offer an excellent “Bullet to Bore” fit. All will require chambering with the appropriate calibre chamber reamer.


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