Samson Manufacturing's +1 Magazine Extension not only allows you to carry more ammo, it also aids in your ability to clear malfunctions. Provides +1 capacity on both 7 round and 8 round factory magazines, and is designed to drop free without catching on the shooters hand. Relief cuts to aid in extracting magazine to clear Type III (double-feed) malfunctions and for one handed malfunction clearing. Leading edge is contoured to facilitate one-handed reloads and act as a finger groove. The Samson Magazine Extension uses factory magazine spring.