Need help with G34 Gen5

Hi,

Here is my new build I need help with - done on top of the existing properly working G17.

G34 complete slide is brand new. It has no cutoffs on the top - solid slide, looks same as G17 gen5, only longer. Spring and rod part is identical to one in the G17 - has a mark 13 on it.

The question is for the owners of a similar gen 5 G34 guns - do you have an issue with 115gr ammo?
I took gun to the range today to test it and setup sights. Took 'venom' rounds with me -
http://www.medefence.net/ - those are supposed to be 115gr.

So, what happened is this - the slide would eject shells fine - but, the cartridge would not load in properly in about of 50% shots - it looked like slide was not able to push the cartridge into the barrel completely, so, it would be needed in most cases to manually pull slide all the way back, shake the cartridge out and manually reload. partially loaded cartridge would be sitting at some angle toward the barrel but not in it.

I went over 2 mags like that, then dismount the leupold red dot scope to remove that weight. It improved the situation somewhat, bringing issues rate down from 50% to 30%-20% underloaded cartridges.

So, the question is - among those Gen5 G34 - is it an expected common issue for 115gr loads to be insufficient to properly cycle the weapon? The obvious solution is to try 124gr and heavier loads - but - i was intending to use this as a competition gun and it would be very nice to make it work with 115gr loads with no issues.

Also, during that ordeal i removed G34 slide, placed on G17 slide - it cycled with no issues, i ran 2 mags of those venom rounds through it. I then took spring out of G17 slide and placed it into G34 - got no improvement of the issue, it would still get stuck on the reloading step same way. This G17 slide was may be through 400-500 rounds so far - so, it is fairly new too.

Range folks suggested several things - one was a hypothesis that may be my right hand grip is too loose for long barrel G34 and that messes up recoil force and a reload cycle - i will test that.
Other thing - OBVIOUS - was to use heavier loads. i will test it too. only others i have now are 'red army' 124gr. they used to be fine in sigs and glocks i have - will see.

Then, as I would really want this gun to take same rounds i use just fine with the G17 - cheap 115gr ones - we talked about ideas of replacing spring with a more stiffer one - that i am not so sure how to proceed with. I know of this product
https://www.glockstore.com/Wide-Diameter-Recoil-Springs?quantity=1&color=1&custcol7=99
but not sure which one to choose.
also I am not sure if it makes a lot of sense to do at all - so - i wanted to post it here in a hope that i am not a first one getting similar issues with a G34.

PS. I am fully aware that 'venom' is an absolute junk - do not punish me for that - but - i was totally out of ammo, so, i got a 500 of those, 50c each, to waste. G17 used to eat them fine, anyway.

 

so, that is what i am lost on... the stock spring is 17lb.

you say i need to use 15lb spring - a weaker one, to let slide to move more backward? the range folks were saying otherwise - to get a stiffer spring, so it would push in harder.

which product is the correct replacement of a stock spring there? one i posted above for the tungsten rod, of this one?

https://www.glockstore.com/Flat-Wire-Recoil-Springs

i can, for what it takes, to order both 15lb and 20lb, but, it would be probably better to know what is correct resolution for the issue here.

 

hi, the barrel is glock, matching numbers with the slide - bnge9xx. new one, i got it from the dealer, it was visibly new.
venom stuff is known to range, they do not 'like' it. where it is sold - online - it states it as a '115' ammo.
looking at the barrel and comparing it with g17 barrel - i am unable to see anything obviously wrong. which does not mean there is NOTHING wrong there - who knows.

 

so, should i order a 15lb spring? this one?
https://www.glockstore.com/Flat-Wire-Recoil-Springs

ps. it is almost impossible to have a poor grip on this gen5 frame with a beaver tail - it fits hand perfectly. but, i never had such long barrel guns, so, not sure what to expect. may be my grip is indeed too loose.

 

i am not sure.

it is a fairly new gun overall. the mag itself, i notices - the gen 5 new glock mag seems to have a much stiffer spring - i always load with no tools, so, i felt it was VERY stiff as i loaded new mags - those are all 10 rounds as i am in MA.

i have several old 17 round ones, but took only one with me. i did not do a proper check if most issues with loading happen on the new mag, but, i think it is also possible.

all in all - i really want this G34 to work, as i really like how it fires and how accurate it is - so, i do want to sort it all out.

i need to look at it more and take some pictures, but, the thing that struck me today was a feel that a round was 'in' - the ejector on the side was popped, as if round is in, the slide was looking as it is all the way back in, the trigger was cocked, but, it would not move. as it was an unusual situation for me i did not capture all the details properly, i think, but, will try again tomorrow.

it is a mass of the slide indeed - same what range guys told me - unbolt the red dot. it immediately improved after that.

 

manually it always works perfectly fine. i did not feel any obstructions. reload felt smooth, it was not getting stuck. gun was wiped clean before range and oiled. should have moved fine. again - like i said - g17 slide moved fine, and it is not that much heavier than a g34 - so, that is why i am now frustrated so much, it was almost $1k for leupold and a slide and now all this.

 

crap it is, but, g17 slide was eating it fine.

 

sorry, i lost my way of thought there. i guess, yes.

all in all i just wanted to make sure if other customers with Gen5 G34 have no issues with a weaker 115gr ammo. If it is a known issue and the 124gr is the lowest limit - i amnot going to love it, but, I can accept that, I guess. It is just so odd.

 

the RSA is the same part in both. as i stated - G17 went over 400-500 rounds in its life so far, so, after first set of jams i took out RSA from G17 and placed it into G34 presuming (may be) it was beaten up enough already to be softer - with no difference to the rate of the issue. only diff happened when i unbolted the scope- to prove it was the weight of the slide.

so, i sent a lot of replies by now - the consensus is to try the 15lb spring?

PS. according to all the data i google/read in parallel right now - G17 and G34 are supposed to be acting absolutely identical and use identical parts for almost everything. and it should work with 115gr ammo. it is getting quite frustrating.

 

I just ordered this one:
https://www.glockstore.com/Flat-Wire-Recoil-Springs
i guess it should be the correct one? i tried to call them, but, no one picks up and chat is not working, covid staff shortages, i guess...

 

damn. after i ordered - i took the damn part out and it is NOT looking as a flat wire to me.