• MBX Extreme 155mm Complete STI Style Magazine 9mm/.38 Cal

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MBX Extreme 155mm Complete STI Style Magazine 9mm/.38 Cal

Other products by MBX Extreme

Item #: 1004-
Reg. Price: $145.00
Our Price: $145.00
Basepad Color  


These are the competition followers which does not lock the slide back but allows for one extra round
INTRODUCING The "NEW" 155mm open Class Magazine from MBX!
* Fantastic Balance
* Easy Reloads
* High Capacity 27 Rds
* 13 Coil Spring Reliability
Great Size and Balance for fast easy Reloads and Draws also Stages when that little extra is needed. Reloads like the "Little Stick" 141.25mm with close to the power of the "Big Stick" 171.25mm.

MBX Complete Tubes were designed to be competition ready with exclusive features to meet the highest demands for today's shooters.

The MBX extreme tube features designed body contour running the full length of the magazine for improved reliability and performance allowing for a wider follower to improve stability also featuring round location holes for 10 & 27 and precision cut feed lips.


- All 126mm 9mm/.38 magazines hold 20-21 rounds. <p>
- All 126mm .40/10mm magazines hold 18-19 rounds.<p>
- All 126mm .45ACP magazines hold 16 rounds.<p>
- All 141.25mm 9mm/.38 magazines hold 23-24 rounds.<p>
- All 141.25mm .40 Cal/10mm magazines hold 20-21 rounds.<p>
- All 141.25mm .45ACP magazines hold 18 rounds.<p>
- All 155mm 9mm/.38 magazines hold 27 rounds.<p>
- All 171.25mm 9mm/.38 magazines hold 29-30 rounds.<p>
- All 171.25mm .40 Cal/10mm magazines hold 26 rounds.<p>


Average Rating:
(based on 10 reviews)

Showing 1 - 5 of 10 Reviews:

by Cameron Tanner
on 6/30/2020
Best 2011 mags available!
Can’t beat them!
by Open3gunner
on 10/3/2019
Excellent as always
It was a quick delivery the merchandise was it like it was described .
And the order was called in very good customer service too. Thanks 
by Kitzmiller
on 8/6/2019
Why use a 140 ever again?!
The 155 mm mag is obviously between the 140 and 170 with regard to capacity. I comfortably get 4 additional rounds in the 155. However, the capacity isn’t the selling point.. It’s the size of the mag tube that seals the deal. The mag loads faster and more efficiently for me, because there’s more room to get my hand on it when I reload. I’m probably not going to buy another 140 mag. Last but not least, I didn’t have to swap springs or followers with this mag like I typically do when I buy a new magazine. What a score! 
by TomF
on 4/22/2019
MBX 155mm magazine
I got two of these magazines, they arrived looking nice with their high polished tubes and great fitting base pads. I did a quick function test to make sure there were no surprises, they worked great, holding 25 rounds in 9mm. I've since used them in a 6 stage USPSA match with no problems at all. I am very happy with the look, feel, function and I highly recommend them.
by Matt S
on 1/30/2019
Feeding issues
The mag would not feed 100% new. I left the mag full overnight to seat the spring. And still had feeding issues. The gun runs perfectly with 4 different sti mags. 

Giving 2 stars since I tried to contact MBX. They do not have a phone #, only email. So I emailed to see if they had a solution. I got no response to my emails, just crickets. So if you have a problem with their product , dont expect any customer service. 

Btw I did get the mag to run flawlessly.  I ended up having to tune the feed lips!

Response from Chuck- Glad you got them running good with your gun. Yes sometimes the variance in geometry between different mags, guns and ammo may require some tuning for your set up. Been doing ti with all makes of mags for 25 years myself. Something the new comers in the sport don't realize, they tend to expect everything to drop in a work across the board with every variable imaginable. Just not realistic. I don't think the 4 rating is fair. More of a jab at MBX for not responding to your email. I do agree sometimes it takes them some time since they are a small operation and go to matches so they are not always in the shop.
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