The Aurora-II is an update of the Fighter Pilot's favorite wipe suppressor. Gemtech's engineers created the smallest" lightest can on the market. The Aurora-II is threaded on both ends" making it compatible with Metric and Standard thread pitches. The Aurora-II is made from Military Grade 70-75T6 aluminum" with the internals composed of 8 neoprene wipes and 3 petroleum jelly-filled spacer baffles. Because it weighs 3.5 oz." it does not require a Nielsen device. The Aurora-II cannot be used with hollow point or expanding ammunition. These types of bullets can cause catastrophic damage to the suppressor and possible injuries.