My ones are 1/2" 20 TPI UNF which is the Most Commonly Used size in NZ. They fit the Manders Silencer (Silver one) which is/was Available in the UK, and was a Standard Fitting on RWS Models a Couple of Years ago. I still have a Few Adapters in Alloy, Brass, Blackened Steel or Stainless Steel. I can send one to the UK Providing im Not Breaking Any of Your Latest New Laws. Drop me an email for any further info.
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May not be suitable on a 13XX unless Your going to use a Longer Barrel.
Grant, N.Z.
