R.F.I Grenade Rifle newest addition to Enfield family

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Added to my small Enfield family 1964 R.F.I No 1 Mk3* Grenade rifle. The bore seems decent,all the numbers match & no import markings I can find. I would love to take a peek under the wood but don't think that will ever happen. No visable cal. markings. Could it be .308 rather than .303 given the late date? Are there any concerns firing other than blanks? Can't wait to unleash some tennis balls.

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