Heavyduty, I've got a pair of the talley light weight one piece rings on my 22-250 Stealth and and have been very pleased with them. They're strong, rigid and very well made.
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I'm going to be moving my Nikon 6.5-20 scope to another rifle and wanted to mount another scope I have with a 50mm objective... I've got to buy another pair because of the ring height. The upside is they are affordable - the down side is I'll have yet one pair of rings sitting around.
TAC