Disclaimer: I am not a gunsmith and do not recommend you modify the internals of your pistol without at least having some knowledge of the mechanics. If you have none, then take your gun to a gunsmith to perform this mod.
So i picked up a 709 earlier this spring. The thumb safety and 2nd strike capable were two of the biggest selling points for me. Coming from a Bodyguard 380, I was already accustom to those and happy to have them in the 709. Only gripe about this piece was the long trigger travel in SA mode. Just didn't care for it. So I took the plunge and pulled the SA sear/spring/pin out of the sear block. This mod was very easy to do. I started by drifting out the two rear pins holding the sear block in place.
You have to gently pry the block out with a small flat head screwdriver. Once it raises a touch, you can pull it out by your fingers. There was '1' pin towards the rear that holds the SA sear and spring in place. Its not a press fit or roll pin, it just literally slides out. Can use something small, screwdriver, toothpick to push the pin out. And when done, your left with the three pieces that make up the SA mode
Here is what the pieces look like put together. Sorry its upside down, but you get the idea.
When removed, there is a empty channel where the SA resided
Next steps was to replace the striker spring. After researching this mod on this website, I came across a post by BigAl512. Problem was his pictures were missing, back when Photobucket screwed everyone over, breaking their links. So I reached out and we chatted a little bit about this mod. He said for his conversion he used a Honor Guard HG9sc striker spring. He spoke to the owner of the company and got a few of them to test. So he passed the info along and I contacted Honor Defense. I spoke to the owner Gary Rammey and told him what I was trying to do. He openly admitted that when they were developing the HG pistol/s, they initially used Glock striker springs for the testing. They now manufacture their own, but said the dimensions were identical to a Glock stock 5lb striker spring.
I decided to try a Glock Xtra power 6lb striker spring from Wolf. Not sure why, but I also bought a Reduced power 4lb just in case I didn't like the results.
Following BigAl512's post [https://www.taurusarmed.net/forums/7...et-screw.html], i figured if the HG spring is a match for Glock's stock weight of 5lbs, and if I'm using Xtra pwr 6lbs, maybe I should do 4 coils vs 3 he cut off the HG spring. Took it to the range and immediately noticed I had a problem. About 1 out of every 3 rds were light strikes. As you can see, the top row are the light strike rds. Next row went off without an issue, and bottom row were 2nd strikes.
Taking things apart, I lined up my oem spring vs the 6lb. I realized that I probably took off 1-to-many coils. So I decided to try the 4lb spring and to my surprise, even though the 4lb spring was considerably longer than the oem spring, it fit without any trimming. I had full trigger travel under DA. Confident the 4lb would still be too light for use, I know knew that I needed another 6lb spring. And DON'T cut any coils this time. So before I re-ordered from Wolf again, I asked myself, can I go heavier?
For S&G I searched for a heavier spring and came across the 'Glock Blue 31 Newton Extra Power spring' for $10 at RockYourGlock. The '31 Newton' equates to 7lbs of force. They also had a Red 28 Newton '6.29lb' spring, but for some reason it was $15. So I went with the 7lb. Here it is compared to the oem spring
Again, like the 4lb, this 7lb spring dropped right in the captured striker assembly without any fitting or trimming. I still retained full trigger travel without any stacking. So I took it to the range again, and shot 50rds. This time was 100% reliable. No more light strikes on the same ammo. For reference, I was using 115gr Blazer brass fmj for both tests. So by eliminating the SA mode, I have gotten rid of the trigger slack issue. And with the increased the pull weight, its results in solid ignition each shot. To me, this makes the gun near perfect for me. I hung up my 380 and now carry this daily.
I like to thank BigAl512 on here for providing me the information on how he achieved this mod on his 709. I'd also like to thank Gary Rammey at Honor Defense for sharing his knowledge. Its not every day you can talk to the president of a firearm company, tell them your interested in one of their parts to modify a competitor product, and they still give you that level of attention and detail. I thought that was very cool on their part.
Last edited by doctorj77; 07-02-2018 at 06:20 AM.
I love posts like this. Details. It's all in the details.
I haven't had light strike issues with mine but I've only shot it enough to break it in and
I run a magazine through it now and than to stay proficient with it.
All the Best,
The smallest minority on earth is the individual. Those who deny individual
rights cannot claim to be defenders of minorities. - Ayn Rand
Forgot to mention that in my initial test with the 6lb spring, I did fired some (20rds) of wwb 147gr jhp as well. Was met with the same light strike results as the Blazer ammo. 2nd test was all Blazer though.
Great article. I haven't had any light strikes with my 709 with almost 400 rounds run through it. Actually I have had no problems with it! Got used to the trigger.
Great Write Up Doc, !!!! , Glad all worked out!!, And again for what you spend in a 200.00 Gun and add the Knowledge of doing your Work Makes lt all worth while, . Happy shooting ,
When I first read through this thread I wondered why in the world would anyone want to defeat what seemed to me to be an unusual but perhaps beneficial feature of having a single-action auto loading firearm that reverts to a double-action mode in the event of a light strike? I'm still on the fence on whether or not to mod my PT740 (same mechanism as the PT709) into a double-action only auto-loader. I have yet to have light strike issues with my PT740 but that doesn't mean that it can't happen. I can see that this mod has the effect of making for a long but consistent, relatively heavy trigger pull. I believe that this aspect adds a level of safety that doesn't exist for those that carry this firearm (un-modded) with a round in the chamber. The thumb safety would need to be engaged in the non-modded mode where in the DAO mode, the safety of the long, heavy trigger pull is a safety on its own (but the thumb safety is still a recommended option)!
I'll be thinking about this mod for a while but there is certainly an elevated possibility that it could happen to my PT740. My first inclination in this type of situation is to NOT defeat the intention of the original design. I'll admit though, that I have done so in the past and will probably do so in the future .
Nice write-up on a mod that definitely has merit. I'll be looking for a YouTube video on this mod.
"A man has got to know his limitations." HC
In addition to My 709 DAO, I Have a 111g2 , Have not decided yet if I want to Make it the Same configuration , I do know that DAO makes it feel a bit more certain about the condition 1 setup, any thoughts ? you already have a DAO Plus a thumb Safety if so desired ,
Last edited by BigAl512; 07-22-2018 at 01:51 PM.
I made the mod to DAO on my 709 today. I also replaced the original striker spring with a 6lbs Wolff Springs spring for Glocks (full length, no coil trimmings).
Tomorrow is the big testing day. I’ll report back.
Last edited by steamburn; 07-28-2018 at 08:36 PM.
Mixed results. It works great bit still had 4 light strikes out of a box of 50 rounds.
I don’t think is the strength of the spring. It has to do with the firing pin orange plastic guide that makes the trigger release ahead of the end of the stroke.
Ordering a Lake SS guide now. Will see what happens then.
Last edited by steamburn; 07-29-2018 at 06:06 PM.