The Vintage POTF and Tri-logo 1984 Luke Stormtrooper is a tough figure to pick up clean and complete with the original helmet. The gun is also a tough piece to find and is often not identified correctly.
Reproduction helmets are available for this figure and often are not identified correctly here are examples of an original compared to reproduction helmet.
The original is always right on the tour panels below. On first inspection and form from front a neat perfect match. The reproduction forth backside has a distinct circle with a triangle above it. 
From the top the original has a faint mold EP mark dead center. the repro does not.
Heres the repro on a figure compared to s custom made helmet form a vintage stormy head. It was cut off and drilled out,- Its a great looking fit to a custom Luke Stormy. !
Lastly the original gun, note roundish front and a smooth barrel – no dents.