This kit comes with everything you need to rebuild your 2010 M68/M203 Grenade. 1 x M0001 Metal Clip Ball Detent for M68 1 x M0002 O-ring 1 x M0003 O-ring 1 x M0006 O-ring 1 x M0010 Refill Valve O-ring 1 x M0011 Refill Valve