The infamous Matt and Jeff DML Black Hawk Down two pack. Designed to model after Ridley Scott's film, Black Hawk Down, which was based on real life accounts done in a book and a series of articles from Mark Bowden about Operation Gothic Serpent.
The M21 is a camo paint job of DML 10 Mountain Ryan's M21 rifle. The CAR-15 for Jeff was the only one made quite like that. The proper attachment rail for the carry handle , to simulate what was shown in the film, was in a DML British set for figure named Colin.
The "Matt" here is a complete repackage from the single Matt boxed set. He is based off of Josh Hartnett's character in the film and the real life Ranger, Matt Eversmann.
The "half cut" Protec helmet in this set was the most coveted piece in the modern side of the hobby for maybe a year or so. One went on Ebay loose for like 50 bucks. The Jeff boots were a new design and IIRC, way too small.
What you did back then was take a flathead jewelers screwdriver, or something close to that, and gently lift off the scope attachment on Colin's carry handle. It was a male/female connector system, the top end was male, and the bottom end has a female end "cap" DML secured it with a little bit of glue as well. All DML M16A2s and CAR15s had a tiny hole drilled into the top of the carry handles, so they could accommodate a scope mount.
You could transfer Colin's Aimpoint and mount to the Jeff CAR15. Then rig a light to it to simulate what you saw in the movie. To do Gary Gordon's custom CAR15, you'd cut the muzzle off of Jeff's CAR15, add in Colin's suppressor, then paint the whole thing.
Here is the DAM Toys version of Gary Gordon's CAR15 that came later. Jeff's had a A2 rear sight system, but the screen accurate version from the film had IIRC, an A1 rear sight system on the carry handle.
I am almost completely sure that DML released the Colin set to try to entice people to buy it to complete a Gary Gordon custom.