The 5 position Gas Plug is compatible with 2010 and later POF-USA piston rifles.

Whether the Gas Plug functions as a 3-position or a 5-position is dependent upon model year. Piston gas blocks have will either 3 or 5 notches cut into the front of the gas block. In conclusion, 2010-2016 rifles will likely only have 3-positions and mid-2016 and newer rifles will have 5-positions.