CZ 858 Tactical

[RangeBob]

because of the barrel length?

No.
It's non-restricted because it's a Named Non-Restricted by an Order In Council.
Specifically this one, SOR/2015-213 July 31, 2015
http://www.gazette.gc.ca/rp-pr/p2/20...rs213-eng.html

SOR/2015-213 and in the below link it uses the definitions of section 3.1 and 3.2 (near the top), to define "Ceská Zbrojovka" and "SAN Swiss Arms" (about 70% of the way down), and section 3.1 and 3.2 use "barrel that is at least 470 mm in length" to define which others would go where, but the ones that are specifically named are done by item number which Names them.

They are prescribed (named) in the below, in a way that overrides the other Criminal Code definitions.

Regulations Prescribing Certain Firearms and Other Weapons, Components and Parts of Weapons, Accessories, Cartridge Magazines, Ammunition and Projectiles as Prohibited, Restricted or Non-Restricted. SOR/98-462
http://laws-lois.justice.gc.ca/eng/r.../FullText.html

3.1 names items 3, 4, 6, 7, 9 and 10 as restricted.
3.2 names items 1, 2, 5, 8 and 11 to 15 as non-restricted

1. Ceská Zbrojovka (CZ) Model CZ858 Tactical-2P rifle (non-restricted)
2. Ceská Zbrojovka (CZ) Model CZ858 Tactical-2V rifle (non-restricted)
3. Ceská Zbrojovka (CZ) Model CZ858 Tactical-4P rifle (restricted)
4. Ceská Zbrojovka (CZ) Model CZ858 Tactical-4V rifle (restricted)
5. SAN Swiss Arms Model Classic Green rifle (non-restricted)
6. SAN Swiss Arms Model Classic Green carbine (restricted)
7. SAN Swiss Arms Model Classic Green CQB rifle (restricted)
8. SAN Swiss Arms Model Black Special rifle (non-restricted)
9. SAN Swiss Arms Model Black Special carbine (restricted)
10. SAN Swiss Arms Model Black Special CQB rifle (restricted)
11. SAN Swiss Arms Model Black Special Target rifle (non-restricted)
12. SAN Swiss Arms Model Blue Star rifle (non-restricted)
13. SAN Swiss Arms Model Heavy Metal rifle (non-restricted)
14. SAN Swiss Arms Model Red Devil rifle (non-restricted)
15. SAN Swiss Arms Model Swiss Arms Edition rifle (non-restricted)