Hadron Airsoft Designs "Saviour" magazine retention system

Hadron Airsoft Designs

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Introducing the new Hadron Airsoft Designs Mk 23 "Saviour" magazine retention system.

As much as we love the Mk23, there has always been one issue which plagues all users, new and old.

Loosing magazines.

We used tape, elastic, velcro, rubber bands, anything to stop us accidentally dropping magazines.

The days of adding these crude but effective modifications are over.

The Hadron Airsoft Designs "Saviour" system replaces the standard single lever action catch, with two slimline independently acting, sprung catches.

This means, in order to eject a magazine, both levers need to be activated, simultaneously.

We also changed the direction of the activation, so the catches are are also pulled into the grip, rather than pushed down.

This addition of the Saviour system to your Mk23, greatly reduces, if not eliminates, the dreaded Mk23 magazine loss in game..


The new Hadron Airsoft Designs "Saviour" magazine retention system..

Saving your mags, and adding confidence to the users of the Mk23 platform.


Compatability:- Mk23 ASG, STI, TM SSX23, SSX303

Spec:- CNC aluminium bodied catches designed by Hadron Airsoft Designs Slimline contoured ergonomic design, perfectly matches the Mk23 form.

Black Anodised finish, can be camouflaged easily if required by the user.

Stainless matched springs used for operation. (Spares available)

Tools:- Small hammer 2mm to 3mm Pin punch (blunt screwdriver, or allen key could suffice) Small flat blade screwdriver Lubricating oil (as required)

Instructions:- Ensure no BB are in the pistol, or magazine

Remove the magazine from the pistol

Use a 2mm to 3mm pin punch to tap out the existing catch pivot pin, and set aside

Remove the existing catch and spring. Store these safely.

Unpack the new Hadron Airsoft Designs "Saviour" magazine system Check there is a LEFT and RIGHT catch (mirror images), and 2 x springs.

Place the LEFT and RIGHT catches with the spring holes facing upwards, and the pivot pin holes aligned

Insert one spring into each upward facing hole (1 in each) If required, add some lubrication to the pivot pin holes, and between the two Saviour catches.

Insert one catch at a time, into the Mk23 lower release lever cavity, taking care not to damage the springs.


Insert both levers and springs together as one unit.

In both methods, the springs may need to be pushed into location with a small flat blade screwdriver, or feeler gauge.

Check the alignment of the Saviour catches with the Mk23 pivot pin hole, and insert the pin carefully.


Check the operation of the catches. Each one should move smoothly, and return to original position.

Check both Saviour catches action, as the magazine is pushed home.

Insert a magazine to test action (no BB to be used during testing)

Check both Saviour catches have to be pressed to release a magazine.

Check activating 1 catch only does not release a magazine, then repeat with the other magazine.

Tests complete.


Video tutorial are available in the build guides section.

8 Reviews Hide Reviews Show Reviews

  • 5
    Mk23 mag release

    Posted by Michael Murray on 23rd Oct 2022

    Brilliant design and saves loosing mags

  • 5
    Hadron Saviour mk23

    Posted by Jim Barrett on 6th Sep 2022

    I highly recommend this magazine retention system over the manufactures system. I have lost plenty of mk23 magazines whilst holstered due to the OEM retention slightly being touched whereas the Hadron Saviour system needs both sections to be used to release a magazine which has resulted in no longer losing magazines from the pistol. It was laos painlessly easy to fit too

  • 5

    Posted by Cj Cook on 28th May 2022

    This product is just that it’s name states “savior” I’ve never had a msg fall out of my Mk23 since it’s been installed!

  • 5
    Hadron Designs: the original and the best!

    Posted by Max Anderson on 24th May 2022

    Fantastic product that is high quality and easy to install. Works perfectly in my ASG Mk23 with ASG mags - no modification required. Absolutely required for any Mk23 build.

  • 5
    Retention system

    Posted by Peter Thompson on 29th Apr 2022

    All I can say is.... If you own a mk23 platform you need this in your life as anyone with the mk23 will at some point lose a magazine or two, this is the best system on the market and build quality is epic and so easy to install

  • 5

    Posted by D. C. Van der Veen on 21st Jan 2022

    Great product! A real savior! Only thing i miss is being able to buy hadron products in the netherlands /europe

  • 5
    Just get one

    Posted by Andrew Lowe on 22nd Nov 2021

    Quick and easy to fit, and at the price if it saves a single mag it's paid for itself. Mags are still easy to release, but only when YOU want them to drop, not when you've accidentally caught the lever when holstering your MK23...

  • 5
    Saviour release system

    Posted by Daryl Ball on 26th Sep 2021

    Went in easily enough. Works a treat. A video might have been easier to follow for an idiot like me but i got it all fitted. Looks great and works perfectly. Wayyy better than the standard tm catch. No chance of accidentally dropping a mag with these in

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