I was not aware that HK made flare pistols. There is one being sold on gunbroker. So far the price is $25. They have a real “H&K” look about them.
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This 19mm H&K flare pistol is in excellent condition with only one tiny spot of surface rust on the safety retention spring and one small patch on the magazine (see photos). This is probably the best designed signaling device of it’s type ever made. It ejects the spent flare shells out the top and the magazine holds 5 rounds.