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<blockquote data-quote="Bed Wetter" data-source="post: 194347" data-attributes="member: 428">To thread the barrel and have an adequate shoulder for 1/2”x28, I need a minimum of .6” barrel diameter. To get there, I’d have to cut the barrel to 16.5” which is just too short. For this reason, Kimber uses a 7/16”x28 thread. Kimber makes a thread adapter to go from 7/16” to 5/8”. This means that at the muzzle, the barrel outer diameter will be .4375” and the inner diameter will be .308”. This will mean a barrel wall thickness of .06475” or ~3/64”. This is very thin, but also keep in mind that the rigidity of the thread adapter will add a lot of strength in that it will distribute weight onto the face of the shoulder.Huh, I just figured out how this works. The key to safely putting a silencer on a pencil barrel is in having an adequate shoulder. Problem solved...- - - Updated - - -SPS barrel profile is surprisingly a lot thicker than a Kimber. Factory specs all say a minimum diameter of .6” is needed for 1/2x28 threading. The SPS is over .6” while the Montana doesn’t hit .6” until you come in 6” from the muzzle. It’s a 22” barrel.</blockquote>

[QUOTE="Bed Wetter, post: 194347, member: 428"] To thread the barrel and have an adequate shoulder for 1/2”x28, I need a minimum of .6” barrel diameter. To get there, I’d have to cut the barrel to 16.5” which is just too short. For this reason, Kimber uses a 7/16”x28 thread. Kimber makes a thread adapter to go from 7/16” to 5/8”. This means that at the muzzle, the barrel outer diameter will be .4375” and the inner diameter will be .308”. This will mean a barrel wall thickness of .06475” or ~3/64”. This is very thin, but also keep in mind that the rigidity of the thread adapter will add a lot of strength in that it will distribute weight onto the face of the shoulder. Huh, I just figured out how this works. The key to safely putting a silencer on a pencil barrel is in having an adequate shoulder. Problem solved... [COLOR="silver"][SIZE=1]- - - Updated - - -[/SIZE][/COLOR] SPS barrel profile is surprisingly a lot thicker than a Kimber. Factory specs all say a minimum diameter of .6” is needed for 1/2x28 threading. The SPS is over .6” while the Montana doesn’t hit .6” until you come in 6” from the muzzle. It’s a 22” barrel. [/QUOTE]

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