MBX 140mm Competition Basepad Extension with Custom Spring for Glock:

Plus 6 Rounds on 17 Round 9mm Glock Magazine for total of 23

For 9mm Factory Glock and ETS Magazines.

Includes:
- MBX 140mm Competition Basepad Extension for Glock
- MBX Custom Spring

Great Features:

• Proven MBX performance one piece design

• Easy tool-less slide pin tube attachment

• 9mm OAL up to 1.165 can be used in MBX extensions

• Round view slot with capacity numbers allows you to load round count you need with confidence

• Easy maintenance with one screw baseplate removal

• Custom designed Wolff extreme duty spring 22 coil for Skinny Mini

• For 9mm Factory Glock and ETS Magazines

• Plus 10 Rounds on Glock 31

• Will Not work on MBX Glock Steel Magazines

FYI:

OAL in testing using factory magazines. We recommend if reloading to start between 1.145-1.155. This stacks well in the tube but if you wish to push out longer than do so cautiously as different brands of tubes. Internal sizes can vary, too long will cash slow bullet rising.

Crimp is very important to magazine feeding. Be sure to keep at factory specs. It’s easy to measure we use Winchester white box that comes in .374-.376. Incorrect large crimp will case slow bullet rise and stiff loading.

MBX Extension Basepad Repair Kit:

Includes:
- Baseplate
- Silicone
- Pin
- Set Screw
- Washer
- Screw