I thought I'd compile a list of CANADIAN production and semi-production manufacturers of the major AR 15 components. Your input is welcome as this begins with what is on the top of my head:
Lowers
ATRS
Blue Line
Dlask
Cadex
Diemaco/Colt Canada (not sold to public)
Uppers
Dlask
Diemaco/Colt Canada (not sold to public)
Barrels
ATRS
S&J
Questar (some US work)
Dlask
Diemaco/Colt Canada (not sold to public)
LPK
Diemaco/Colt Canada (not sold to public)
BCG
Dlask?
Diemaco/Colt Canada (not sold to public)
Buttstocks and Furniture
Diemaco/Colt Canada (not sold to public)
Cadex
Railed Fore-ends
ATRS
Cadex
Diemaco/Colt Canada (not sold to public)
Other Rails and Accessories
Cadex (rails, mounts)
Dlask (rails, brakes)
Spartan Precision (brakes)
NEA (brakes, Tac latch)
I think NEA is brewing up some bigger stuff in the near future as well.
Let me know what I missed/messed.

Lowers
ATRS
Blue Line
Dlask
Cadex
Diemaco/Colt Canada (not sold to public)
Uppers
Dlask
Diemaco/Colt Canada (not sold to public)
Barrels
ATRS
S&J
Questar (some US work)
Dlask
Diemaco/Colt Canada (not sold to public)
LPK
Diemaco/Colt Canada (not sold to public)
BCG
Dlask?
Diemaco/Colt Canada (not sold to public)
Buttstocks and Furniture
Diemaco/Colt Canada (not sold to public)
Cadex
Railed Fore-ends
ATRS
Cadex
Diemaco/Colt Canada (not sold to public)
Other Rails and Accessories
Cadex (rails, mounts)
Dlask (rails, brakes)
Spartan Precision (brakes)
NEA (brakes, Tac latch)
I think NEA is brewing up some bigger stuff in the near future as well.
Let me know what I missed/messed.

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