Stag-10 CDN Rifle (received NR Status)

[ESnel]

Why not? I thought the lower was the "firearm"

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It is but if the lower accepts AR-15 uppers then it's considered an AR or AR variant. Also note the Stag 10 is built around the .308 and larger so matching an AR-15 upper would be to small(width,distance between pins).

Canada Ammo sold/sell a single shot .50 upper that fits an AR-15 lower which makes it restricted. A Canadian company offered a lower which required permanently modifying the upper so it no longer worked with an AR-15 lower. Under those conditions the rifle now became a non-restricted.

There are a number of companies that manufacture a proprietary upper/lower that use a large number of AR parts but don't fit AR uppers/lowers. The Stag 10 is an example of this as to the number of DPMS 308 AR parts it uses but is not considered a 308 AR or variant.