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Gunsmithing Gas Block Role Pins

Are you talking about the roll pin the holds the gas tube into the block? It doesn't matter which it side starts from. It's a roll pin! If you are talking about pinning the block to the barrel you wouldn't use a roll pin. You would use a tapered pin.
 
Make sure you're looking at the muzzle while observing where the brass flies. Common rookie mistake. ****Disclaimer added to protect from liability*****!