Welcome!
Caliber, any markings stamped, serial number, etc. There's a sticky here somewhere that gives a list of features that would belong in the description...
I'm betting your "build-up" is a commercial, which would have its numbers tucked discreetly away.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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