Race Master / Alpha-X Insert Block Assembly (Magnetic)
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Manufacturer: Double-Alpha Academy
Reviews: 4.9 of 5 Stars!(4.957)

Race Master / Alpha-X Insert Block Assembly (Magnetic)

PLEASE NOTE: If you are ordering a holster or an insert block for a CZ TS checkmate or CZ TS Orange, please contact us first with a picture of your trigger guard area. CZ seem to be using two styles of frames for these pistols ,and without seeing your gun, we will not know which insert model you need. More details here: Click here for more details.

Over the years, we occasionally heard from customers the following complaint: “sometimes, when I try to re-holster my gun, the slide lock is down, and I have to lift it manually”. This complaint was almost exclusively from Tanfoglio or Sig shooters.

As it turns out, the issue never was that the slide lock had fallen down, but rather that the edge of the trigger guard on these guns, being steel and often a little sharper than plastic guns, was catching on the upper tooth of the slide lock – rather than sliding past it to engage on the lower tooth, as it should. As a result, the slide lock would move down under the trigger guard, rather than engaging on it, forcing the user to first lift the slide lock all the way up before re-holstering.

This issue is caused because the slide lock is only lifted on the draw as far as it needs to go to release the gun. That means that upper tooth is displaced sideways only as far as was needed – and no more. Not all the way to the upper end of the track. 

So – after some trial and error, research and development, we are pleased to offer you the new Magnetic Upgrade option for your Racer or Race-Master holsters.

This system incorporates a pair of powerful magnets, which are positioned to reject each other – creating what feels like a spring-loaded system – and two very distinct positions for the slide lock – all the way down – and ALL the way up.

Now, as the gun is released on the draw – the magnets continue to push the slide lock upwards – higher than the gun itself pulled it – thereby ensuring that when you come to re-holster, there is no chance of catching that upper tooth as you holster. 

An additional benefit of this magnetic system is a distinctive “click” which is heard as you holster. Something that is common with other holsters, and requested by some for the Race Master as well.


Read the following instructions carefully before using this holster or Insert Block:

  • Never holster a loaded firearm without first engaging its safety.
  • Check periodically to ensure your safety is functioning correctly.
  • Never disengage the safety of the firearm until well clear of the holster and the muzzle is pointing down range.
  • Make sure you are fully familiar with the correct use, and adjustment of your DAA Holster before attempting to use it with a loaded firearm.
  • Make sure that you have the correct holster/Insert model for your type of firearm.
  • Do not use a holster that is unsuited to your firearm, as that could result in unreliable retention or release which could lead to a fatal accident.
  • Never use a trigger shoe or a widened trigger with this holster.
  • Double check that the retention and release work well, particularly if any modifications have been made to your firearm.
  • Care must be taken to ensure the gun is placed properly when returned to the holster. It if it is not positioned correctly, it will not be held securely and may fall out.
  • Never holster the gun quickly or with force, as that increases the chance of making contact with the trigger.
  • Any adjustment or modification to the holster design may render it unsafe or cause malfunction.
  • Take care that the firearm is not dislodged or knocked when holstered, particularly when the holster’s safety lever is unlocked. As this holster has no muzzle support, take care that the muzzle of the gun is not bumped upwards, as this may dislodge the gun from the holster
  • Keep your fingers well clear of the trigger when holstering and drawing the firearm.
  • The holster should be locked when running or jumping with a holstered gun, or you should keep your hand on the gun’s grip to prevent it accidentally falling.
  • Handling a loaded firearm, and drawing it from a holster is inherently dangerous. You do so entirely at your own risk and responsibility.  
  • Liability is limited only to the replacement of this holster or parts thereof. No additional warranties are expressed or implied by the manufacturer or the distributors.


Showing: 1 - 5 of 57
Race Master / Alpha-X Insert Block Assembly (Magnetic)
Markus Friedl
Date Added: Monday 25 June, 2018
Ordered 2 for the TSO. One did not fit but that's because CZ changed the frame. But I got immediately a replacement for free. This one also fits perfectly. Very nice product! Great Service!
Rating: (5 of 5 Stars!)
Race Master / Alpha-X Insert Block Assembly (Magnetic)
James Smith
Date Added: Wednesday 06 June, 2018
I have the same issue with this as others have had. I am using this for a Gen 4 Glock and the fit is terrible. I had to remove a lot of material to get it to fit properly. I uderstood when ordering I would have to remove material upon ordering, but I never expected as much as had to be. After I got it to fit it still wouldn't go all the way down so the locking bar would lock. I had to again remove material from a different area to get it to lock. This created about a 1/4" of play when locked. It stays safely in the holster, but for the $50 cost it shouldn't require so much fitting in my opinion.
Rating: (3 of 5 Stars!)
Race Master / Alpha-X Insert Block Assembly (Magnetic)
Graeme Cooper
Date Added: Tuesday 05 June, 2018
As with all DAA kit this is an excellent addition to my rig. By using the Alpha X holster I can accommodate all of my different guns without having to run multiple rigs. High quality, excellent fit and very easy to slip in and out of the main holster. First rate as ever.
Rating: (5 of 5 Stars!)
Race Master / Alpha-X Insert Block Assembly (Magnetic)
Jimmy Perito
Date Added: Tuesday 22 May, 2018
This product is made well but has fitment issues on a Glock Gen 4. I am not sure if this is the case for Gen 2, 3, and 5. For the price that this is sold for, this should have a very minimal modification to make your glock fit. There is a major mod that you will be doing in order to make this product fit. You will be cutting or taking off materials on the actual block to get your glock to fit. I was told that not all glocks frames are the same as far as tolerance. But this product IMHO is just way off, I am talking about a lot of materials need to be removed. Not what I was expecting for a company that makes a high end gear.
Rating: (3 of 5 Stars!)
Race Master / Alpha-X Insert Block Assembly (Magnetic)
Chris Stadler
Date Added: Monday 09 April, 2018
I have one of these for the Sig P320 and one for the Phoenix Trinity (for my Atlas Titan). These are awesome. Nothing else to say. Holds my heavy 2011 with ease. Allows a fast draw and locks up secure. All the things a good holster should do!
Rating: (5 of 5 Stars!)
Showing: 1 - 5 of 57

Race Master / Alpha-X Insert Block Assembly (Magnetic)

Full Name:
E-Mail Address:
Telephone Number
Alpha Dynamics USA
2908 Betz Court, Orefield, PA 18069
Phone: (888) 628-3233 or (610) 366-9752
Fax: (610) 366-9680
E-mail: sales@cedhk.com
Models and Fitting

Q: I have one of the newer Sig X5 models. Will the Sig X5 insert block fir the new model?

A:, yes it will. In fact, we tested the new Sig X5 and X6 models and they all fit to the X5 insert block.