KNS Adjustable Piston for Bulgarian AK74

KNS Adjustable Piston for Bulgarian AK74  Tool-Free Adjustment Reduces felt recoil No need to remove or replace your gas block for adjustability. Just change the piston, and go shoot. User can tune almost any AK for suppressed use without permanent modifications Decreases cyclic rate for full-auto fire Made in the USA and counts as a 922r Compliance Part Piston head assembly made from corrosion-resistant stainless steel All surface parts are nitrided for durable, low-friction, easily-cleaned operation The KNS AK Adjustable Gas Piston Assembly is a revolutionary drop-in solution for taming overgassed AK platform firearms. The patent-pending KNS AK Adjustable Gas Piston is a replacement for the Kalashnikov's gas piston that attaches to the bolt carrier. The replacement takes about 10 minutes to install and, requires no major gunsmithing or permanent modification to the firearm. The end result is a firearm in which the user is granted an extremely wide range of gas adjustment for suppressed and un-suppressed use, as well as the ability to fine tune the firearm for a variety of of ammunition. Many users have been pleasantly surprised to feel the difference in how their firearm shoots with the KNS Adjustable Gas Piston System installed. Is this the right upgrade for me? A good rule of thumb to determine if the KNS AK Adjustable Gas Piston will be useful for your firearm, is if your gun throws it's spent brass over 15 feet. If so, this can signify excess gas pushing the carrier back at a higher velocity and pressure, than is needed for effective operation. Overgassing causes more felt recoil, more wear and tear, and makes the firearm less controllable. Small Bore/Caliber pistons are for .223″, 5.56mm, and 5.45mm. Large Bore/Caliber pistons are for 7.62×39, .308″, and 7.62x54r.