I have an SLR GB-7 low-pro gas block and a Daniel Defense barrel that DD no longer sells (16" mid-length S2W). The gas block comes with a roll pin, but I'd like to use a taper pin instead. Is there a go-to gunsmith that the M4C hive mind recommends? Need the barrel drilled for both the set screw and the pin, and the gas block has a starter hole where the roll pin goes but needs to be drilled as well (which is why I'm assuming I can convert this to a taper pin).

Thanks.

(Also, if I'm wrong about preferring a taper pin please educate me.)