Gas piston upgrade for your AR-15. Switching to a gas piston operating system from a direct gas impingement one leads to a cleaner and cooler operating rifle. This should lead to fewer malfunctions and considerably more time between cleanings. The OPS-416 kit is a true drop-in gas piston conversion, installing easily in a few minutes with a minimum of tools or technical expertise.
For barrel diameters no greater than 1.00"
Compatible with the following calibers: 223 Rem/5.56x45mm NATO, 5.45x39mm Russian, 7.62x39mm Russian, 6.5 Grendel, 6.8mm Rem SPC