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[Permx11]

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[Thanatos2203]

Have you tried looking through the "Historic Products" section of their website?

[Hairball]

Sorry, not much help but here is a link that might get you closer to what you need. They talk about a BOSS system on page 7 that appears to be a threaded barrel.

http://media.winchesterguns.com/pdf/om/model70_manual_om_s.pdf

[ar15barrels]

I am trying to locate the win model number for a model 70 heavy varmint in .223 rem and whether they had a threaded barrel option.

The BOSS threaded barrels did not have threads that you could thread muzzle brakes, flash hiders or suppressors onto.
They were a funky size that would only accept the BOSS devices, wether vented or non-vented.
I only mention this because some people might think they can just get a BOSS model and the put something OTHER than a BOSS device on the barrel.