Magnum Research is a higher end brand, which uses Ruger components This calibre is .17 HMR (18" barrel) with modified titanium breach. But also ncludes a 16.5 inch.22 WMR barrel for easy switch using the same magazine. Reliable and trouble free, semi-automatic rifle. Trigger is fully worked, smooth and light. 9 shot rotary magazine Threaded for suppressor (1/2x20) Ruger M77 rings available for buy now only. Hogue stock has some marks but in good condition. This is a precision rifle, fitted out for a marksman - I've regularly acheived 1/2 moa grouping with CCI A17 ammo. Only selling as it doesn't get used.