Tikka T3 Magazine modification

I received a Tikka T3 .223 Magazine in the post yesterday, a very smart looking thing carefully wrapped in bubble wrap and boxed ready to use. Just one small problem, the magazine is very limited when it comes to the OAL of loaded rounds, the bottom line is you cannot feed a round built to full length from the magazine which means you either single feed, or buy new bottom metal and magazine to suit, or modify the magazine……

Now bearing in mind these things are made of what appears to be a hard plastic and taking into account the cost of a replacement or the alternatives I could see this was going to be a very interesting project.

First job is pop the follower and spring out and then split the magazine which comprises of an upper section and base, a careful lever or two with a screwdriver (Cringe moment #1) and the whole lot was in pieces on the bench. The upper section has a wall in it which acts as the rear stop for the bullets and it needs removing, this involved some careful sawing with a hacksaw blade and a final clean up with a Dremel type tool. (Cringe moment #2) I tend to look on such tools with contempt however I do own something of the same ilk although mine came from a store in DK for under DKK50 (Around GBP5.50) The ‘Danskdremel’ actually did the trick and I could now fashion a new rear stop block so armed with some rough measurements and a suitable lump of 6082 T6 I retired to the Mill.

The idea was to fit a block that kept the spring and follower in the same position yet allow a new OAL of 2.550″

Here is the block machined to size, you can see the three parts of the magazine including the clips that hold the uppers and lowers together.

The view into the upper half with the block tested for fit:

Next job was mill the lower web back by 17,5mm so the new block would fit in place and be supported, as far as I could see the only neat way of doing this was in the mill with a long cutter, so the lower was wrapped with masking tape and locked in the vice ready for the first cut (Cringe moment #3) Did I mention the Tikka T3 plastic is hard and brittle and this part involved some very cautious cuts. In this picture you can just make out the lower web now it has been machined back and all that is needed is a clean of the areas that had been machined and glue the block in.

I was determined to do the whole thing without any visible indication of fixings so I opted for an epoxy adhesive and attached the block to the upper half of the magazine. Once set it was just a matter of assembling the whole lot and testing and here it is complete with new longer .223’s

So what did I learn? Well if you glue the block into the upper section is makes it difficult to push the upper and lower section together so next time I would machine a relief along the lower back edge of my block to make assembly a bit easier. Also the Danskdremel actually did the job it was supposed to however I am tempted to mill the upper web out if I ever get asked to do this again.

Am I pleased with the job? Given the number of cringe moments, too right I am pleased with it and this T3 will now be able to feed a reasonable length round from a magazine that externally looks just like an unmodified one.



7 Replies to “Tikka T3 Magazine modification”

  1. impressive, I’m wondering if you can do this modification to my Tiikka T3 magazine, if so let me know the cost and how I gets the magazine to you.

    Kindest regards

  2. I was looking at doing the same thing, but did not have the guts. Would you consider doing more as the previous post suggested if so then i would also be interested. If not would you have the dimensions of the block you inserted and if you were able to use rounds with max oal once completed. My other option would be to fit a new bottom metal that takes aic mags, but that will be a lot more expensive i think

    1. Steve, I have modified a few now and I am still twitchy about doing the modification, the scary part is pinging the case apart and these days I pull the follower and spring out and then drop the case in fairly hot water, the case is not a thermo-plastic as such but it does seem to make life easier. Instead of machining a follower from a lump of aluminium as I do you could use a small section of channel with a spacer behind, remember to put a chamfer on the bottom rear edge of the spacer or you will have problems pushing the two halves of the case back together.

      I cannot remember the OAL this modification gives you however it is enough to take long built SMK 80’s. I will pull out the block dimensions and post them up and I can certainly modify one for you if you wish.


  3. Hello David,
    Sorry for not getting back to you before. It would be interesting to see the the dimensions are as my Brother in Law runs a precision engineering company and if i had them he would probable be able to make the block for me. I am still considering getting a new bottom metal and use AIC Mags. Still wondering at the mooment. Looking to get better accuracy at longer ranges. Seem to have got a good load for the lower distances, just want to get a longer AOL if i can

    1. Steve, here you go:


      The width is missing however I have a feeling it is 12,9mm – best thing is pop the magazine open and measure the internal width.


  4. Hello,
    great modification, and actually simple to do if you have access to a milling machine. Many thanks for sharing this!

    Many, many T3 users in 223 Rem have the problem of unreliable feeding as the magazine lips seem to be too wide to place the cartridge properly horizontal.

    By looking at the image of the loaded mag I can see the cartride pretty much tilted upward with only a very small part of the cartridge bottom available for the action to pick it up for cycling.
    Usually the first round does but between #2 and #5 the action slides over the cardridge without picking it up.

    So do you have reliable feeding with your modified mags?
    Many thanks,

Leave a Reply

Your email address will not be published. Required fields are marked *

HTML tags are not allowed.

345,032 Spambots Blocked by Simple Comments