Kaw Valley Precision 17-4 AR-15 Carbine Spring Features The Kaw Valley Precision 17-4 AR-15 Carbine Spring is machined from 17-4 stainless steel a material chosen specifically for its strength and resistance to fatigue over extended use. This spring is rated for 10 000 cycles giving shooters a durability margin well beyond typical factory-installed springs. A passivated finish protects the stainless steel from corrosion helping the spring maintain consistent performance through repeated exposure to heat carbon fouling and moisture. Built specifically for carbine length stocks and pistol kits it is a direct fit for standard AR-15 platform builds. This carbine spring is intended for use in AR-15 rifles chambered in 5.56 .223 and .300 Blackout and it can also be used to fine-tune the cycling of pistol caliber carbines. Pairing it with a Kaw Valley Precision 4.3 ounce or 5.4 ounce buffer allows shooters to dial in the exact recoil impulse and cycling speed their build requires. Upgrading to a 17-4 stainless spring is a simple affordable way to address inconsistent cycling or premature spring fatigue. For builders chasing smoother function from their carbine length AR-15 or PCC this spring is a dependable foundation. Kaw Valley Precision 17-4 AR-15 Carbine Spring Specifications Manufacturer: Kaw Valley Precision Model: 17-4 AR-15 Carbine Spring Material: 17-4 Stainless Steel Finish: Passivated Cycle Rating: 10 000 Cycles Compatible Hosts: AR-15 PCC Available At: GrabAGun