I have a SIG P226 Scorpion that I bought last year brand new. I installed a Grey guns Enhanced Leverage System, Grey Guns Sig P-series custom strut system, and a SIG original SRT kit awhile ago. I have an ongoing issue where the gun will go from SA into DA while firing but it happens randomly. I can shoot 3 magazine without issue and then it will suddenly happen once then go back to SA. I have full dissasembled/reassembled the gun twice and the issue still persists. The overtravel and pretravel adjustments don't show any issues resetting while dry firing. what could be the issue? thank you for your time.

Given that you have installed Grayguns parts, I strongly recommend contacting them as well. Even though their parts are probably not the problem, they are usually very helpful and would be more aware of what might cause it than most of us here.

When a Classic line DA/SA SIG like that decocks on its own when firing, my first thought would be a problem with the hammer/sear interface or, less likely, that somehow you are contacting the decocker while shooting.

Are you absolutely 100% sure that you are not unknowingly actuating the de-cocker under recoil? Not saying you are, but I'd want to rule that out before digging into the mechanicals.

Hello and welcome to the forum, Wronka.

quote:

Originally posted by Wronka:
I have an ongoing issue where the gun will go from SA into DA while firing but it happens randomly. I can shoot 3 magazine without issue and then it will suddenly happen once then go back to SA. I have full dissasembled/reassembled the gun twice and the issue still persists.

The fact that your problem is happening so intermittently leads me to believe that the problem is more than likely something you are doing rather than the pistol itself. If I understand what you are saying, this problem is occurring about once per box of ammo (3 magazines x 15 rounds per magazine).

Is there any chance you could let someone else shoot the pistol and see if they can replicate the problem?

Thank you for the replies and sorry for the late reply. It seems to happen once in a 10 round magazine when it does happen but I can go through an entire magazine without the issue happening. I had my brother in law fire it and it happen to him as well. He is a salesman at the range I go to and he is also unsure of what it could be. I contacted Greyguns directly and they said its possibly a fault seer spring so I put the stock seer spring back in and had the same problem. Could it be an issue with using a Sig SRT kit with the Gray guns parts? thank you again

quote:

Originally posted by 92fstech:
Are you absolutely 100% sure that you are not unknowingly actuating the de-cocker under recoil? Not saying you are, but I'd want to rule that out before digging into the mechanicals.

While I’m not saying that is IMPOSSIBLE I would imagine it’s pretty tough to do. Even with a horrible grip/really poor recoil mitigation that decocker throw is pretty long and deliberate. I could totally see riding the slide stop but the decocker seems unlikely.

NOTE- I am NOT saying this because I think the advice was stupid or some such and it is a perfectly valid thing to check. I was just saying that it’s probably less likely than a mechanical failure in this case.)

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While I’m not saying that is IMPOSSIBLE I would imagine it’s pretty tough to do.

I agree it's unlikely...moreso now that we know a second person has tried it and experienced the same issue. But I've seen crazy thing happen. I'm not sure if the OP is right or left-handed, but a left-handed grip can play hell with the P-series decocker, especially if their technique is imperfect in other ways as well.

I was helping with a class this spring and we had a guy who kept having what appeared to be failures to eject in a Glock 19...like 2 or three times per mag. Definitely not a problem I would expect with that gun. I watched him shoot for a bit, and realized that with his left-handed grip he was pushing his thumbs up and blocking the ejection port. He didn't realize he was doing this, and even after I showed him the problem and how to correct it he kept subconsciously doing it for a while until it finally sank in.

In the OP's case, if we're confident that it's not a shooter related issue, or the sear spring, I'd start by backing the trigger adjustment screws all the way out and see if that resolves the problem. I've found with adjustable triggers that perfection is sometimes the enemy of "good enough"...the natural inclination is to try and adjust out every bit of pre-travel and over-travel, but usually you have to leave a bit more than my perfectionist mind would like to get optimum reliability. And sometimes what you can get away with in dry-fire doesn't work once you introduce recoil forces in live fire.

It's also possible something is improperly assembled or out of spec on the gun, but that's going to be hard to diagnose without being able to examine it in person.

Just letting you guys know I switched out the SIG SRT and replaced it with a Grayguns SRT kit and so far after 250 rounds no issues. seems to be solved

Good deal thanks for the followup!