HK SL8-5... SL8-6 What is the difference?

one is grey, the other is black. i think....someone else should answer shortly. im sure its the color sheme
 
SL8-6 is a new black version for the USA (which only ever got the grey SL8-1). The SL8-6 is essentially the same as the SL8-4, but the rail is slightly different, and I believe it takes single stack 10-round magazines.
 
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