HK VP40 & VP9 Compensator By Anarchy Outdoors. Those considering upgrades for their HK VP40 or VP9 should look at the Anarchy Outdoor compensator. This aftermarket part is a significant advancement from the factory HK. Download Heckler and Koch VP9 Compensator Instructions. The Kickback Reduction of Anarchy Outdoors’ HK Compensator. The Anarchy Outdoors HK compensator for the VP40 & VP9 reduces up to 50 percent of felt recoil. This kickback reduction is possible because the compensator attaches to the muzzle, allowing the gasses to combat recoil without sacrificing shot power. Reduced recoil mitigates muzzle flip, keeping the sights trained on target for faster, more accurate follow-up shots. HK VP40 & VP9 Compensator: Features & Benefits. Up to 50 percent reduced kickback. Does not sacrifice shot-power. Reduces the time between shots. Color options: black, red, blue, gold, or purple. The Anarchy Outdoors Compensator is not compatible with threaded barrels. This product is not manufactured, authorized, endorsed, or warranted by Heckler & Koch. More HK Upgrades to Consider. If you like this upgrade, you may want to check out our other HK upgrades. HK VP9 &VP40 upgrade package. Or each part individually. We also have an. Upgrade kit for the HK VPSK. The Anarchy Outdoors Guarantee. At Anarchy Outdoors, we want our customers to know that they can count on the quality of our products, which is why we have a.