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Looking to purchase an original HK 91 retractable stock. How can I tell if its an original or a knock off? There seems to be a large gap in prices looking on the net. $200 to well over $500 and sometimes close to $600. Are there markings I should be looking for? Thanks for any help.
 

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The most common available will be surplus Bundeswehr, which range from unissued to poor, and original HK. Primary difference is the finish, with the HK being "paint over park" and the military being straight phosphating. All things being equal, there is no functional difference.
 

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The ones you see for around $200 are surplus German Army. These usually have a date code on the bottom of the stock end cap and a serial number on the sling loop side, some are marked with HK next to the date code. The serial number on the side is usually X'ed out and have a phosphate finish on the end cap. These usually have a convex butt with a hard rubber end plate either glued on or riveted on.

The more expensive ones are the one's with the concave butt, these are a early variant and are covered in a plastic material similar to the early Colt carbine aluminum collapsible stocks.

The most expensive ones are the commercial ones that bore the same blue-gray colored paint that the early HK9X series had on them and the newly manufactured ones that are sold on HKspecialiststore.com.

I bought one of the surplus one's that was in excellent condition and degreased the end cap and hit it with some semi-gloss alumahide and it looked brand new. The phosphate finish makes an excellent paint base. I'd get an excellent surplus one from HKparts.net or watch the parts for sale forum.
 

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No, there's no marking on the commercial ones, if that's what you're looking for. Generally, the HK factory stocks have rivets holding the rubber butt pad on, I think POF and some other manufacturers use slot head screws. If you've got an original finish HK91 with the blue-grey finish it's easy....is it blue-grey or not? There's one (or was haven't looked lately) on Sturm that the seller said came off an original HK91 his dad bought in the 80's, he wanted $300 for it. I tried to buy but he couldn't confirm if was black or blue-grey.
 
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