Notes: This might be thought of as a standard US Army M-24 sniper rifle "given the Canadian treatment." Most of the changes are in the machining and finish of the parts, which gives the AT1-C24 a smoother action than the normal M-24. The rifling twist has been improved in a manner similar to that of the C-3A1 to improve the performance of the rounds fired from it. The barrel is made of stronger and better-quality steel, giving it a life of at least 10,000 rounds. The normal fiberglass stock is replaced by one made of Kevlar, and can be had in several colors or color patterns. Three versions of this rifle exist; the AT1-C24 fires 7.62mm NATO ammunition and is fed from an internal magazine; the AT1A-C24 fires 7.62mm NATO and is fed from a detachable box magazine; and the AT1M-C24 fires .300 Winchester Magnum and is fed from an internal magazine. Standard versions of these rifles have no iron sights, but instead come with a MIL-STD-1913 rail for mounting a telescopic sight. However, iron sights, are optional, as is a suppressor. The AT1-C24 is listed as being used by "several police agencies."

Twilight 2000 Notes: As with many such weapons, some quantities of AT1-C24s were taken into service by the Canadian and US military.

Notes: The C-3 is an improved version of the British Parker-Hale Model 82. Some of the changes were made to suit Canadian manufacturing practices, but there were many true improvements made to produce the C-3 – the stock was made adjustable for length of pull by the use of spacers, the rifle was given dovetail mounts on the receiver to allow the use of several different telescopic sights (though the Canadian Army’s standard scopes for the C-3 is an Austrian-made Kahles 6x) or iron sights, and all exposed metalwork was given a non-reflective finish. The C-3 was accepted for Canadian service in the mid-1970s.

The C-3A1 is an improved model of the C-3. Differences include a new McMillan A2 synthetic stock with stock spacers to allow the length of the stock to be altered, a strengthened receiver, an internal three-round magazine replaced with a box magazine feed with double the capacity of the C-3, a modified bolt handle to allow a surer grip with a gloved hand, and an attachment point for a detachable bipod. The twist of the rifling was altered to allow more accuracy from both standard and modified 7.62mm NATO rounds. The normal Kahles sight of the C-3 was replaced by a Unertl 10x scope similar to that used by the US Marines.

Today, virtually all C-3s have been placed in reserve stocks or sold off to civilians (after suitable modifications). The C-3A1 is still in common use by Canadian forces, and probably will be for quite some time.