A gunsmith at your local (if you have one in your town) would be able to give it the once over very quickly, the personnel on this web site collectively have probably 5-600 years experience but without having access to the rifle to investigate whether it is suitable to fire can only point you towards having a competently trained person to look it over. I have never heard of "renta gauge" I had a machinist turn up some for me .064, .067 and .074 the 74 one being get it sorted as there are head space problems. Vincent is on the track of a visual I do not know about the string routine but !
My rule of thumb is to get it checked by a person who is qualified and experienced if we get into the he said she said and it goes south on your mate or you then all sorts of things happen if you get my drift. And no one here will pass that weapons serviceability with out being able to physically check the weapon over.........
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