dansedgli Posted March 14, 2016 Share Posted March 14, 2016 (edited) My edge has started to send 2 down range with 1 pull of the trigger. I thought it was dirty so cleaned it up well, 250 rounds later it did it again. My half cock notch seems to function when the gun is unloaded, isn't it supposed to stop this kind of thing happening? With the grip safety removed the disconnector seems to be working as it should so I'm thinking I'm up for a clean up of the sear and hammer faces. I recently replaced the STI trigger with an SVI trigger but I used the same trigger bow. I've got plenty of pretravel. Could too much or not enough overtravel cause this? I don't think I have too much but it is something I've read. It's quite the experience with 357 sig at 180pf. Edited March 14, 2016 by dansedgli Link to comment Share on other sites More sharing options...
jcc7x7 Posted March 14, 2016 Share Posted March 14, 2016 Too much over travel can. Set it appox .020 Link to comment Share on other sites More sharing options...
dansedgli Posted March 14, 2016 Author Share Posted March 14, 2016 Thanks, I'm pretty sure the overtravel was/is ok now. Link to comment Share on other sites More sharing options...
DaveFromAus Posted March 15, 2016 Share Posted March 15, 2016 What's required to fit the svi trigger to the STI bow? Wanting to change my 2011 so I can change the profile and find the best. Did you have to open the trigger guard as the SVI are wider? No good smiths in WA so bit of a pita. Thank you Link to comment Share on other sites More sharing options...
dansedgli Posted March 15, 2016 Author Share Posted March 15, 2016 It's not difficult but some people reckon they don't have to do it at all which is interesting. The SVI trigger bow is crimped into the SVI trigger. I cut out the top crimp portion and pulled it out by force. I dremeled the STI trigger off the STI bow then cut down the bit that goes into the SVI trigger a bit so it sat at the right height. I used a loctite 2 part epoxy to stick the bits together. It still feels solid after 600 or so rounds but I'd still prefer not to have it like that. SVI trigger shoe is wider so grip has to be opened up or trigger shoe reduced. I've ordered some SVI ignition parts so I'm going to fit all new SVI stuff and see if the the stock SVI trigger bow is still too long. Link to comment Share on other sites More sharing options...
BeerBaron Posted March 15, 2016 Share Posted March 15, 2016 How much pressure do you have on the sear spring? Too light and you get doubles. It's common with guys who've just done a trigger job and got carried away trying to lighten the pull by bending the sear spring. Withought that pressure on the sear it stays up briefly and the hammer follows the slide for that super fast second shot... Link to comment Share on other sites More sharing options...
Quack Posted March 15, 2016 Share Posted March 15, 2016 (edited) Check the sear spring. I had an issue with hammer follow, it didn't show up when dry testing, but with live fire it would follow. Edited March 15, 2016 by Quack Link to comment Share on other sites More sharing options...
steviesterno Posted March 15, 2016 Share Posted March 15, 2016 just register it as a post dealer sample! then point it at the target in the A zone, one trigger pull, 2 Alpha! I had a similar issue show up in dry fire when I put a 2011 back together (luckily caught before live fire) when I was much newer at shooting. I had put the sear spring in wrong, so the hammer wasn't catching the half cock notch. re-installed and was good to go. Link to comment Share on other sites More sharing options...
bountyhunter Posted March 15, 2016 Share Posted March 15, 2016 (edited) My half cock notch seems to function when the gun is unloaded, isn't it supposed to stop this kind of thing happening? It should assuming the sear nose has come into the hammer hooks far enough to catch it with enough sear spring force to keep it from being knocked out of the way. Definitely want to make sure sear spring is installed correctly and has adequate tension. If memory serves me I thought the first thing to suspect on 1911/2011 multiple fire events was a problem with the disconnector (?) Edited March 15, 2016 by bountyhunter Link to comment Share on other sites More sharing options...
eern Posted March 15, 2016 Share Posted March 15, 2016 I agree that it is the sear spring. I just purchased a 2011 that the sear spring was all bent up to get a light trigger and was getting doubles or more. replaced the sear spring and no more issues. Link to comment Share on other sites More sharing options...
dansedgli Posted March 15, 2016 Author Share Posted March 15, 2016 I put a new spring in it while i was at the range on the weekend after it started doubling . I only had 40 rounds left to test it with though and it didn't do it. Ill give it another few hundred before i trust it. I just figured the half cock would prevent this happening. I'm too limp wristed to keep both shots on target at 10 yards. Link to comment Share on other sites More sharing options...
zzt Posted March 15, 2016 Share Posted March 15, 2016 The very first thing I would look at is the hammer hooks. I think you will find they are worn and no longer square. The sear nose is probably in good shape. Sears are usually quite hard. STI hammers; not so much. If it is the hammer, you can easily recut the hooks and square everything up. However, you'll also have to recut the primary on the sear. If you have access to a True radius jig you can be done in five minutes pretty much regardless of where the new hammer hooks are. Personally, I'd just replace the hammer with a new, hard one (not STI). Link to comment Share on other sites More sharing options...
sfinney Posted March 15, 2016 Share Posted March 15, 2016 Sear spring to light Hammer hooks rounded Sear nose angle wrong Something about your whiz bang S_I trigger contraption not being true and binding in rear position Not necessarily in that order. Link to comment Share on other sites More sharing options...
titandriver Posted March 15, 2016 Share Posted March 15, 2016 Glad to see you back Sean!!! Link to comment Share on other sites More sharing options...
ranger Posted March 15, 2016 Share Posted March 15, 2016 I had that happen at a match and everyone wanted to copy the 2 round burst feature - not fix it! It was a leaf spring issue. Link to comment Share on other sites More sharing options...
dansedgli Posted March 15, 2016 Author Share Posted March 15, 2016 If it was my 9mm it would be more welcome. 357 sig Major power factor is new to me still. Link to comment Share on other sites More sharing options...
BeerBaron Posted March 16, 2016 Share Posted March 16, 2016 I put a new spring in it while i was at the range on the weekend after it started doubling . I only had 40 rounds left to test it with though and it didn't do it. Ill give it another few hundred before i trust it. I just figured the half cock would prevent this happening. I'm too limp wristed to keep both shots on target at 10 yards. half cock notch wont stop it. think about what's happening. the half cock notch to function has to hit the sear blade. if the sear blade is still lifted high enough it won't catch (the sear must have enough lift to clear the half cock notch when trigger is pulled otherwise hammer would always just catch the half cock notch when you pull the trigger). I would say new sear spring cured it. you are not limp wristed dan. just run a few bill drills to man you up to the sig power! Link to comment Share on other sites More sharing options...
dansedgli Posted March 16, 2016 Author Share Posted March 16, 2016 It's got me confused a bit. When my old trojan hammer followed it would catch the half cock notch. I don't get why this gun is different. Link to comment Share on other sites More sharing options...
Got Juice? Posted March 16, 2016 Share Posted March 16, 2016 If it was my 9mm it would be more welcome. 357 sig Major power factor is new to me still. But it IS addictive.... the blast, the smell of H110, the RO's uttering blue verbose with each stroke of the bang switch.... Link to comment Share on other sites More sharing options...
dansedgli Posted March 16, 2016 Author Share Posted March 16, 2016 Haha do you use light projectiles? I use slow powder loaded with 160 grain projectiles at 1.25 inches. I want to try 125s one day. Link to comment Share on other sites More sharing options...
Got Juice? Posted March 16, 2016 Share Posted March 16, 2016 Haha do you use light projectiles? I use slow powder loaded with 160 grain projectiles at 1.25 inches. I want to try 125s one day. 15.6gn H110 and 124gn Berrys... 180 pf.... Link to comment Share on other sites More sharing options...
dansedgli Posted March 16, 2016 Author Share Posted March 16, 2016 Holy crap that's a lot of powder. It would light up the skies. Link to comment Share on other sites More sharing options...
Got Juice? Posted March 16, 2016 Share Posted March 16, 2016 Holy crap that's a lot of powder. It would light up the skies. It does tend to flash a little bit. Smooth as glass though Link to comment Share on other sites More sharing options...
xd1977 Posted May 12, 2016 Share Posted May 12, 2016 Had the same issue when I changed out my internals to Extreme Engineering matched hammer, sear and disconnector. My grip safety did not engage the sear spring properly and caused a nice little full auto charge which emptied my 140mm magazine that had about 10 rounds left in it. All 10 alphas on 1 target though..shocked the hell outta me! Link to comment Share on other sites More sharing options...
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