Sizing advice required from Commencal meta AM 29 owners

Hi. I would be intrested in hearing from any Commencal Meta AM 29 owners. Im 5'11" bare foot so am looking at either a medium or large. I know that the sizing chart would suggest a large but at 19.5 it seems a bit big? Please could you let me know your height and what size you ride thanks.
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VOODOO CANZO
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VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
Alright the arm length can be a bit where from but inside leg?
It's the same reason you can't use trouser waist sizes for your waist measurement, many a bloke thinks he has a 34" waist because that's the size in trousers he buys, when the tape measure comes out it's more likely to be 36-38".