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You have a WWII British military rifle that was arsenal reconditioned per the FTR (Factory Through Repair) designation. hnter gave good advise. If your rifle has the micro adjustable rear sight, it must be raised to remove the bolt from the receiver.
Shooting corrosive ammo requires some additional cleaning steps much like shooting blackpowder. Regular gun solvent and oil are inadequate to properly clean the bore after shooting corrosive ammo. G.I. bore cleaner works well as does hot soapy water patches followed by wet patches, then dry patches and oil patches. Failure to get the corrosive salt residue out will lead to rusting and pitting of the bore. Hope this helps. All the best...
Gil
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