Luth-AR Bolt Gas Rings - 30 Pack Silver. ..Luth-AR offers an aftermarket gas ring designed specifically for replacing the factory gas rings. When the round arrives at your door simply remove the old gas rings slide the new one onto the piston compress the two gas rings together and drop the piston into the mag well. No more having to remove the safety or charging handle to get to the gas port and back to the breech. This set includes both the upper and lower gas rings. Luth-AR gas rings are made of heavy duty aluminum and are designed for extended use heavy use down range. They do pack a punch and can be used for any caliber simply give the new gas rings a few twists and you are back in service. Specifications for Luth-AR Bolt Gas Rings: Manufacturer: Luth-AR Color: Silver Package Contents: Luth-AR Bolt Gas Rings Luth-AR BT-01-30P: Bolt Gas Rings - 30 Pack Silver