Glock Recoil Spring Assembly 14 dual .45 Auto/10mm for Models G20 & G21 Gen5 Only mkd 0-4-1 95340CD2 GL. This is the original factory part that comes as standard equipment on your Mini-Glock. For a more durable recoil reducing and muzzle flip control consider trying one of our stainless steel or tungsten guide rods with a variety of spring weights to choose from. Specifications for Glock Recoil Spring Assembly 14 dual .45 Auto/10mm for Models G20 & G21 Gen5 Only mkd 0-4-1 95340CD2: Manufacturer: Glock Fabric/Material: Polymer Features of Glock Recoil Spring Assembly 14 dual .45 Auto/10mm for Models G20 & G21 Gen5 Only mkd 0-4-1: Durable recoil reducing and muzzle flip control Stainless steel or tungsten guide rods Variety of spring weights to choose from Package Contents: Glock Recoil Spring Assembly 14 dual .45 Auto/10mm for Models G20 & G21 Gen5 Only mkd 0-4-1 Polymer factory replacement part. This is the original factory part that comes as standard equipment on your Mini-Glock. For a more durable recoil reducing and muzzle flip control consider trying one of our stainless steel or tungsten guide rods with a variety of spring weights to choose from. GL33829