I have two Sionics Patrol Three E rifles and have been pleased with them. As far as I can tell Sionics and Centurion should be on the same level of build quality. The late member here, Iraqgunz (RIP), was an armorer for Sionics and he was very well respected here.
I have not handled a Centurion rifle to compare the two, however it seems on a high level they are the same quality, just differences in rail, furniture, and available barrel contours.
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