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P229 DAK to DA/SA Conversion

1124 Views 10 Replies 2 Participants Last post by  SoloScuba
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I’m sure there are a lot of post on this topic, this is just my experience.

Bought a LE Trade In P229 DAK in .40 S&W last year, at a Gun Show from one of my previous LGS making the rounds for $380 OTD with just one mag and nothing else.

I’ve always wanted a Sig in .357 Sig and I let another cheap LE Trade In P226 get away from me a couple of years ago. But I like the feel of the P229 better so nothing ventured nothing gained.

Found a .357 Sig barrel for it only to learn the sights needed to be changed for that caliber. This P229 was not that old, August 2017 when I called Sig. The old night sights were actually still under warranty and after some hoops they sent me new night sights for this gun. Just not the height needed for .357 Sig, so I bought some TruGlo the correct heights, #8 front and back. Gun shoots better than I’m capable of.

Kicking around a lot of ideas on where I wanted to go with this gun, and a lot of PMs to Willard. Ended up winning an old P229 .40 S&W parts kits for not a bad price off Gun Broker. Now I have the parts to make my DAK into a DA/SA plus a separate .40 S&W upper. Again, night sights shot on this slide, but they will work well enough in the day light to try out the .40 S&W upper.

Watched a number of disassembly and reassembly videos on YouTube then bagged all my spare parts so I knew what I had and could add and replace the correct parts at the correct time.

I had disassembled the P226 frame when I owned it and I have to say this was easier to do than I remembered.

Since my old parts kit was from 1992, there are a couple of issues. The hammer strut and main spring parts are of a much older design. Not as easy to install as those with the plastic mainspring seat, but not impossible with a Glock punch.

The one part that is just too old to fit is the hammer reset spring. I’ve studied it and watched a video and it just was not made for the hammer stop on this 2017 gun. I may have to break down and call Sig for a new design hammer reset spring.

I know I could end up putting more money into this gun than buying new. In addition to the new .357 Sig barrel and night sights, I’ve bought two used magazines from CDNN in better condition than the one that came with the gun. But I’ll have two caliber specific uppers, even if one is much older and if I touch nothing else I’m sure it will outlast and out shoot me. Heck I may even holster it up for daily carry in .357 Sig.

The big return for me on this gun is what I have learned taking in apart and putting it back together. It won’t be the last time, and I need to practice on those uppers too. So just sharing, I may have the whole thing nickel boron or cerakoted after I’m done tinkering, I’m thinking a burnt bronze upper with the black frame might be unique?

P229 DAK



P229 DA/SA now



Original strut and mainspring on the left, old design on the right.




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Admin, didn’t see any action from you on this one so please keep it now that we have conversation on it. I marked the other two with “DUPLICATE” in the title, it those can be removed I’d appreciate it.


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Your Hammer Reset Spring, coming out of a kit should be correct. The P220 version is similar, but slightly larger looped diameter than the P226/P229 version. The "short" leg coming straight off the coil is what fits between the Stop, and Frame. The "longer arched" leg, is what is placed over the Strut Pin, in the Hammer. I find it easier to install the Reset Spring, into the Hammer Stop, then installing it behind the Hammer, with the Arched leg over the Hammer's pin. I then hold the assembly in place, with a 1/16" punch from one side, while starting the Hammer Stop Pin from the other side with a brass Hammer, which drives the 1/16" punch out.

The P220 is a little more difficult, due to the smaller diameter of the center of the Hammer Stop Pin used on it, being an interference fit through the Hammer Reset Spring's coil.

If you want to upgrade your Strut Assembly, to use the long plastic Mainspring Seat, send me your address. I have plenty of the short Struts that go with it. While you could use the DAK Mainspring, you could also get a 19# Wolff unit which would be a little lighter tension. If you want to go to the E2 system, the Struts seem to be available, but the short Seats seam to be Out Of Stock most places currently.
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Willard, if you remember this wasn’t really a DA/SA kit but parts from an older DA/SA P229.

This is the only thing that remotely looks like a hammer reset spring in those parts and I can’t get it in the hammer stop so it will go back into the gun.

What are your thoughts? Maybe the older, 92-93 vintage P229s had a different hammer stop?




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That looks distorted... basically I don't believe they have changed, since the beginning. The P225 was likely the first Sig model to use a rebounding Hammer, then the P226 and P228, as the P75/P220 initially had a non-rebounding Hammer, until around '94/'95.
So there’s a gun shop up the road from me that’s a big Sig Sauer dealer, they have a whole room dedicated to Sig and Sig parts. I’m going to ride up there and see if they have any P2XX series parts in stock. Maybe I can find one so I can get to the range tomorrow.


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So there’s a gun shop up the road from me that’s a big Sig Sauer dealer, they have a whole room dedicated to Sig and Sig parts. I’m going to ride up there and see if they have any P2XX series parts in stock. Maybe I can find one so I can get to the range tomorrow.


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What you need is known as "Spring-21"...

Font Gas Brand Fashion accessory Metal


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Scored this one for a whopping $3.13! FrogBones, Melbourne Florida rocks. I think this is going to work.




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Got to the range today and everything is working in DA/SA. With both my .357 Sig upper and my .40 S&W upper.

Not having a good vision day so I didn’t waste too much ammo, only 25 rounds in each caliber.

I’m pleased with the outcome and will be placing some extra parts in the classifieds to fund additional upgrades.


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Willard got the strut today, thanks so much I really appreciate it.

If there is a part(s) from my spares kit I didn’t use, please let me know and it’s yours.


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Good mail call today. Got the strut from Willard, thanks so much.

Saw GrayGuns had a few pieces on sale with free shipping.

Custom Fat Guide Rod and
Master Spring System will start with the 19 pounder.




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