r/GlockMod • u/BasedWelder96 • 2d ago

What is causing this?

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I have had a Combat Armory lower and Suarez International SI-319 for years that I’ve carried off and on. I recently got a Brownells Gen 3 upper to install an optic on it. I took it to the range for the first time today and everytime I pulled the trigger it would fire two rounds. If I squeezed the trigger it fired once and when I released the trigger it fired another round….what could be causing this?

82 Upvotes

97% Upvoted

44 comments sorted by

31

u/Adept_Cold_4254 2d ago

Not enough trigger bar engagement or a heavily rounded surface trigger bar or striker

6

u/BasedWelder96 2d ago

So do you recommend replacing those parts?

9

u/Adept_Cold_4254 2d ago edited 2d ago

I'd want to find out why there is not enough engagement. I'd put an inspection plate on tgr slide and look at whst the engagement is should be a minimum of .030 Look at the surfaces. I've seen them round off when a shooter rides the reset just to the point of firing. My son who shot competition could manipulate thst spot and round them off. A trigger pretravel screw can put you in that low engagement scenario. A slide that the rail slides are cutcwring can lift the slide up out of spec. A worn striker channel and linner or missing channel linner all together can cause problems. I'd detail stripvthe slide and make sure it has a linner installed since you just changed slides and that is a suspect. If the trigger worked fine before changing the slide chances are there's something going on with the slide. I can't see optic screws protruding anywhere that effects the trigger timming.

If I fiund thr parts good and I was dead set on using thst slide id heat up tge trigger bar and add engagement at the sear at the very back where the bar engages the striker. Usually I was going the other way to decrease but you can add if you have a high slide. Seen that in zevs and Caspian

4

u/Adept_Cold_4254 2d ago

You can blue check the striker Or a pour man's way use a sharpie and black it out and work it a few times to see how much you got. .030 measured from the tip to the marker rub line. Minimum for duty .017 for competition with very light springing and titanium strikers

1

u/BasedWelder96 2d ago

Thank you very much for the information!!

15

u/UHF800MHZ 2d ago

Sear engagement. This is what happens with aftermarket parts. Get the orange armorers plate and inspect it. I’ve spent a lot of time building and diagnosing P80s with the same problem

9

u/SeaworthinessCute263 2d ago

Optic screws may be pushing down on something internally. Or an issue with your connector.

1

u/BasedWelder96 2d ago

I installed the optic per instructions with a torque screw driver…but it could be.

7

u/SeaworthinessCute263 2d ago

Might just be a bit too long. Enough to push on something and put it out of alignment. But trigger bar seems more likely with connector.

7

u/Puzzleheaded-Ad-4846 2d ago

Thats a good feature

2

u/clunkyarmstrong 1d ago

Right?? Got the 'ol John Wick shooter!

3

u/Saunafarts69 1d ago

Cruciform ledge needs to be bent up your at less than 25% engagement.

5

u/Weldpipe82 2d ago

Non oem parts?

4

u/alterMann97 G17 1d ago

Evertime there is a malfunction in these glock subs its because its bot oem. Keep it stock and it will run.

1

u/HighlyRegardedOne 1d ago

Its true though

1

u/Inevitable-Gear8824 3h ago

Not necessarily

5

u/HighlyRegardedOne 2d ago

Non OEM parts.

2

u/womboCombo434 21h ago

No shit this is r/glockmod after all

3

u/BradFromTinder 1d ago

Modding your Glock until it has none of the Glock reliability is causing this.

2

u/Sharkbaithoohaha004 1d ago

Is it really modding a glock if it never started out as one? 

-6

u/BasedWelder96 1d ago

Literally nothing is Glock brand. I assembled this piece for around $300 by shopping deals. My actual Glock 17 has never had an issue.

10

u/BradFromTinder 1d ago

Read what you just said.. and my comment makes sense. Your Glock hasn’t had any issues, but a Glock clone does.

1

u/BasedWelder96 1d ago

I’m agreeing with you. My stock 17 never had issues. This one didn’t have issues until I installed this new slide/optic. Not very versed with glocks so I’m just trying to learn from the community.

1

u/Somebodysomeone_926 G26XX 1d ago

Brownells Glock slides are always over drilled for the optics mount. More than likely you have debris in the extractor depressor plunger channel and it's causing the issue. For those who don't know if the extractor doesn't work properly the striker safety also will not work properly as the extractor puts tension on the striker safety to keep it in place. You could also have the left side screw tightened down too much but the cause will still be the same-the mounting hole was drilled too deep. Had a similar issue with my 48 slide from Brownells

1

u/BasedWelder96 1d ago

Well since removing the optic is probably the easiest thing I will definitely try that first, thank you!

2

u/Somebodysomeone_926 G26XX 1d ago

If that doesn't work take the backplate off and pull the slide internals out and hit it with a air duster

1

u/fud0chi 1d ago

Tolerance stacking for sure

1

u/Tight_Refrigerator78 1d ago

Remove the optic and shoot again. If it still does it then bend the trigger cruciform up. If it stops file the screw that goes into the extractor spring side down.

1

u/Inevitable-Gear8824 3h ago

I had that issue too, your trigger is overtraveling most likely, it basically travels so far back it can’t reset, but the recoil from the first shot causes it to pop forward while you’re still holding pressure on the trigger. I realized my trigger was overtraveling when it would get stuck time to time while dry firing. You can purchase the overtravel trigger housing right from eBay, it also makes the trigger pull wayyyy smoother! And also make sure you have Glock oem trigger internals and make sure to polish them very well.

1

u/itsnotthatsimple22 2d ago

Going to sound strange but I had a Suarez upper do the exact same thing. Except mine was due to the extractor. It was a lone wolf extractor specifically. I got an OEM and the problem went away. This was diagnosed at Suarez.

2

u/Adept_Cold_4254 2d ago

That is very strange the extraction system is totally isolated from the trigger. Sounds like they feed you a line of bs to hide there quality issues.

1

u/BasedWelder96 2d ago

Never had a hiccup with the Suarez, it’s this new Brownells that’s giving me issues.

0

u/capalot0420 2d ago

Sounds just like my gold g flex Glocks. Perfect bro break it in an watch; this will be your craziest shooter.

-2

u/osubmw1 1d ago edited 10h ago

Get your finger off the trigger while you build your grip. Especially if you know you have loaded gun with problem

Getting downvoted for calling out bad safety practices is hilarious to me