Glock 19X w/ PMM JTTC Ultra problems

#1
Installed a PMM JTTC Ultra on my G19x last week and tried to give it a sping this weekend at the range. Milled for RMR and Overwatch Precision drop in trigger, but stock otherwise.

At least once per mag it was choking up (FTF) on a variety of 115 gr range ammo. Switched over to 124 grain and the issue dropped to every other mag or so.

I DID see that if I gripped it like it was the only thing holding me on the earth the issue disappeared, but that was hard to sustain without a lot of focus.

Anyways, I'm thinking maybe trying a lighter recoil assembly to clean things up a bit and I'm looking for recommendations on weights. It's either that or I invest in some grip trainers.
 
#2
What you’re experiencing isn’t uncommon with comps. Best solution is to tune it with recoil springs if you insist on the compensator.


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#4
If the Gen 5's are sitting at 22lbs, any advice on what would help with it? 18 maybe?
I don’t have experience with the Gen 5s with comps. My Gen 3 and 4 guns like 15 lbs and the 17 lbs with a KKM comp/barrel. These weights functioned from cheap 115 gr ammo all the way up to 124 gr +p. With springs it’s always a balance and trade off.

What I did was buy a Zev guide rod and I can swap spring weights easy. Pick up one spring of each weight and you’ll figure out which is going to work for you. They are like $5 ea. Experiment a bit then when you find the right one, buy a stack of them.


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#6
Is that the single port one that works with aftermarket barrels or the dual port that only works with the proprietary PMM barrel?

I have the single port model on a 19 and a 45 and they both run anything I throw in them with stock springs. I also have the single port on a 17 and had to swap in a lighter spring (I forget which one, it was from Sprinco and was the middle spring of their Gen 5 pack)

I do remember with the 19 having to run a few hundred through it to get the barrel worn in, but I think that may have been a combination of the aftermarket barrel and the slide coating after RMR milling.
 
#7
Installed a PMM JTTC Ultra on my G19x last week and tried to give it a sping this weekend at the range. Milled for RMR and Overwatch Precision drop in trigger, but stock otherwise.

At least once per mag it was choking up (FTF) on a variety of 115 gr range ammo. Switched over to 124 grain and the issue dropped to every other mag or so.

I DID see that if I gripped it like it was the only thing holding me on the earth the issue disappeared, but that was hard to sustain without a lot of focus.

Anyways, I'm thinking maybe trying a lighter recoil assembly to clean things up a bit and I'm looking for recommendations on weights. It's either that or I invest in some grip trainers.
Try Nato Spec 124 grain. All of my feeding issues went away once I switched to that ir other 124 +P loads. 147 works perfectly if it’s at 975 to 1000 FPS.
 
#8
Once I can get a steady supply of NATO I'll give it a try, but the 124 I can get my hands on hasn't yielded great results just yet. I'm looking at a Springco kit to try to fix things, but at this point I may just go back to stock. I'm fine with trying to wring more out of the weapon, but I don't want to compromise the reliability too much. This may just be a learning experience for me and comp's may just not be my thing.
 
#9
Once I can get a steady supply of NATO I'll give it a try, but the 124 I can get my hands on hasn't yielded great results just yet. I'm looking at a Springco kit to try to fix things, but at this point I may just go back to stock. I'm fine with trying to wring more out of the weapon, but I don't want to compromise the reliability too much. This may just be a learning experience for me and comp's may just not be my thing.
Is the 124 you’re using now +P? That's your best bet.