$50-$60 each recently. The best I've found was $39.95 at an Austin, TX gun show, but that was years ago; should have stocked up. The length on these is optimal which makes them popular, hence they don't come up often. If the only way you can find them is with the gun, then they get pretty expensive.
About a month ago I got four from a seller on Gunbroker. They were just under $44.50 each including s.h.i. He told me he had more but would not list them at auction. He put them on Sturmgewehr.com for $50.00 each and sold the rest at that price.
A forum dedicated to and laser-focused on Heckler & Koch firearms, Heckler & Koch accessories and the owners and enthusiasts that love them! Come join the discussion regarding HK pistols, long arms, NFA arms, HK accessories, HK history and trivia and more.