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Bryan, yes sir, this fits compacts with a picatinny rail. So this will fit and function just fine on a hk vp9sk. Hope this helps.

Bryan, yes sir, The XC2-B comes with five different Crossmembers (#1 is pre-installed) which are designed to fit a variety of weapon accessory rails. Crossmember #3 is for the VP9. Stay safe & have a great day!

Absolutely, this will be good to go with the VP9SK. This model comes adjustable for ease of fitment.