Here is an example of a late war Stg 44 magazine. The clear finish is also known as "bonderized" by some collectors. Other portions of the rifles, such as the foregrip, pistol grip section and other small parts will be found with this finish.
http://www.rjmilitaria.com/mp44m2.htm
Here is a mention of the late war clear finish from an MP44 resource:
http://www.milsurps.com/showthread.php?t=4012