Wolverine 140rd MTW-308 Magazine M110 Step 3: see 2 grooves

Step 3: see 2 grooves on the inside of the ring cap

Receiver: High Strength Polymer w/ Molded Metal Inserts

Gearbox Material: Cast Zinc Alloy

Do note that this magwell will only fit the airsoft P320 X-Frames and will not fit the SIG AIR Proforce P320 M18 / M17 Frames

Wolverine 140rd MTW-308 Magazine M110 Step 3: see 2 groovesThis 140 round mid cap magazine with Empty Mag Detection is specially designed for MTWs with 308 lowers including the MTW 308 and Genesis Arms Gen 12 Shotgun. Details Fits 308 lower receivers Empty Mag Detection capable Approximately 140 round BB capacity Rugged construction No winding, no rattling mid cap magazine High efficiency compression spring Compatibility MTW M4 MTW 9 MTW 308 MTW Shotgun