Taurus PT709 Erratic Trigger Force
I'd like to compare experiences/discoveries with other Taurus PT709/740 owners/shooters/smiths.
My 709 started exhibiting erratic trigger force and by that I mean the required trigger pull would vary anywhere between 3 lb and 10 lb. I understand that this is no target pistol but I found that wide variation disconcerting; I was particularly concerned about the very light force measurements. I have read of others with heavy triggers (like 9 lb) who sent their gun back to Taurus for repair and were generally happy with the result although the repair tickets were pretty vague about what was replaced/adjusted/repaired. My problem seems different to the extent the force varies shot-to-shot. Given that the problem is intermittent I cannot be sure exactly when it began.
As an aside, Taurus previously replaced the front sight and the barrel (and maybe other things) because the pistol shot low and I replaced the extractor which cured an incomplete extraction/jamming problem. Other than this trigger force issue, the pistol is now reliable so I'm reluctant to send it back to Taurus again.
Prior to this problem I had removed the firing pin (striker) assembly a few times for cleaning, etc. and I think this may be related. The owners manual advises not to disassemble the slide (which would include removing the striker). The striker/firing pin rides inside a plastic sleeve and that sleeve controls the vertical position of the firing pin lug with respect to the frame and the sear. The plastic sleeve also rubs against the Taurus Locking mechanism when removing the firing pin assembly and it takes a bit of force to push the firing pin assembly out of the slide.
So I think it's possible that this plastic sleeve was deformed in a way that causes the firing pin lug to press down against the sear causing the high forces. Also, sometimes the sear fails to catch the firing pin lug if the slide is racked very briskly (this has never happened with ammo loaded). I suspect the plastic sleeve may cause the firing pin lug to be too low causing it to strike the sear prematurely, sometimes causing it to bounce and not fully engage the lug (sometimes missing it entirely) or to catch the lug squarely but also press down with excessive force making sear release difficult
I have read in many places that the 709 is supposed to have a great trigger so I think my gun has a problem. I would be interested in feedback from others who have experienced and (especially) solved 709 trigger issues.
By the way, I previously asked about this on the Taurus Armed site but the responses were along the lines of "that's normal for a belly gun" or "send it to Taurus". I don't agree with the first solution and I don't want to return the gun for such an intermittent problem.
Thanks in advance for any insights.
PT709 Erratic Trigger Force - FIXED
I think I fixed the erratic (not erotic) trigger on my PT709.
Short recap: My 2010 model PT709 exhibited erratic trigger force; required trigger force varied randomly between about 3 lb (practically a hair trigger, just over the 2 lb take-up force) to over 10 lb (will thus thing ever fire?). I solicited advice on TaurusArmed but the moderators there were less than no help, so I moved my discussion here. I sent the gun back to Tauru$ Miami (see above) with a detailed letter explaining my problem and I suggested possible causes (including a weak/damaged sear spring). Taurus replaced several parts but the trigger force was still erratic after the gun came back from Miami.
Action and result: Still suspecting a weak sear spring (a restricted part that Taurus will not sell) I disassembled the sear bracket and un-bent the sear spring to increase the upward force on the sear. So far so good! The single-action trigger force is now a very repeatable 6-6.5 lb. This is just about right for a self-defense weapon, IMO. Time will tell but I'm a happy camper so far.
Analysis: The "weak" sear spring failed to reliably hold the sear in the full-up position to catch the striker foot as the slide came forward. So when I racked the slide (or fired the gun) the striker foot wouldn't catch and seat the sear consistently in the forward notch. So the sear landed in different parts of the "notch" depending on the dynamics (speed, vibrations, etc.) of slide movement. In fact the sear completely failed to catch the striker on some occasions. Also, the stronger sear spring reduces the down force on the sear ears (from the striker spring) and this should help reduce trigger friction also.
Cautions: In case anyone decides to disassemble the sear bracket assembly on their PT709 I have two cautions. First, there is a small 2-2.5 mm ball bearing under the safety lever to provide a detent for the safety lever. This ball bearing is under spring pressure and it is VERY easy to lose. Second, the sear spring is a pig to get back in during reassembly but there is a trick. Run a loop of thin dental floss through the coil of the sear spring and up through the slot in the top of the sear. Then you can use the floss loop to pull the spring into place as you slide the pivot pin into place (through the bracket, through the sear side slot, and through the loop of the spring). But DON'T lose the sear spring or you'll have to send the whole gun to Miami to get it replaced.