Is that a rail or a radiator?
Only half-kidding, because cooling fins would definitely be a worthwhile addition to the dust cover of an HK P7. The gun was not designed with 1000-rd/2-day pistol classes in mind. Folks I knew who took P7s to gun school usually had two or three of them and rotated through them as they got too hot to stuff down your trousers.
I like the traditional Heckler & Koch magazine setup, as well.
Via TFB...
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