The triangular two slot handguards were adopted at the onset of the Inch pattern program by Canada, Australia
and the UK
.
Made variously in Coachwood, Walnut and Beech and fully interchangeable.
This pattern was closely based on the Fal three slot examples.
It was replaced in the UK and Australia as they tended to split along the cooling slots, also they could smoke after extended use.
The Canadians took a different approach and moved to a single hole in their handguards, they never adopted the laminates.