Mesa Tactical 6-Shell, Both Sides, Side Saddle, 12 Gauge, SureShell Saddle with Rail 13, Fits Kel-Tec KSG, Black 93000 SureShell Aluminum Shotshell Carriers with Rail are machined from 6061-T6 aluminum and use Mesa Tactical's innovative rubber friction retention system to firmly and reliable hold shells in place until needed.