Gunworks Canterbury SPARTAN suppressor, set up to suit 308Win. I purchased it 3 July 2014. Its approx. 35mm diameter, 340mm long and is threaded with one of the Gunworks options of 9/16" x 18 thread per inch. Set up with a rear bush nut for a 19mm diameter barrel but will supply with a "stock" bush nut so you can ream out to fit your barrel. Is in as new condition but has been repainted over anodising with black etch primer which can be easily removed with petrol. It has a "plastic" clamp over it to allow for attachment of rifle sling further forward that the stock allowed so that it sits down on the shoulder better. This can be removed easily as its only zip tied on. I keep a diary of all shots fired in all my rifles and can say that this suppressor has only had 96 shots fired through it. I have since re-barrelled the 308 and have opted for a different suppressor for the sake of balance only. Performance from the Spartan was more than acceptable.