Quote Originally Posted by Peter Laidlericon View Post
Why do they have to be re-proofed Thunderbox? Is it something to do with re-importation or.........

In their original form, the rifles do not have a proof mark on the bolthead (just an inspection mark and - sometimes - a very faint crossed pennant), and the bolt-body only bears the military "BM" underneath the bolt knob. As the Proof Notes issues by the proof houses are vague and ambiguous over what exactly constitutes valid civilian proof, most importers, auctioneers and dealers err on the side of caution and have the rifles re-proofed so that a recognisable "BNP"/"CP" appears on each component.