I believe the Gen 4 and 5 is essentially the same slide, just the front serrations are present on the gen 5. I thought about picking up a 19x slide and slapping it on the derya frame but then I priced it out and it just doesn't make sense. a 19x MOS slide complete is going for $500+, the island is $300 shipped and I don't need to do anything further to it. Slap on an optic and just run with it. Plus it will function and work on the frame and if not, it's covered under warranty. I'm waiting till next year when the DY9Z hit's the CA roster (fingers crossed).
DY9 Island barrel
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I saw a video from several months ago that mentioned the front site was not removable and some other issues with the slide cut fitment and RSM that were apparently corrected.
Does anyone know if the front site was made removable?
Does anyone know if the front site was made removable?
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Just DROS’d a DY9 today and also ordered the “Island” complete upper
No tax & no shipping fee on the Derya Arms website 
it is removable, just nothing exists to replace it....
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Hopefully soon, at least there is hope!
*Update 12-22-25 Derya confirms they are working on a suppressor height sight solution.
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After shooting the DY9 island I can confirm that it’s better than gun for the price.. it shoots flat as he’ll and other than the first 10-20 rounds no malfunctions
Have you put an optic on that island slide? I'm wondering how the co-witnessing will be like since there's no aftermarket irons available yet.
They are not suppressor High sights… can’t really co-witness tbh
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Meaning they are too low in the window or ?? What optic are you running?
Did some digging on reddit and found that it actually has some co-witness. Looks more like 1/4, could be 1/3. At least it has something without having to upgrade sights. Here's a pic he took from the rear. Now the 10 day just needs to come sooner!
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This will solve the gap issue: https://www.strikeindustries.com/si-g-sap1.html
I just got this item in, and I can confirm this fits well with OEM Glock Gen 3 slides. Now for a range test in a few months
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Simple process
Yep... that was the first thing that went when I brought mine home too!
I love the way this trigger feels compared to my G19. The trigger shoe feels so much better than the factory glock as it doesn't stick out so far forward. I normally like flat shoes but I can live with this shoe.
Right out of the box, I was getting roughly 4.5lb, removed the factory connector and installed the DOT connector and was getting ~4lbs. I then purchased a TTI grand master kit and swapped all the components in and it completely dropped the weight and made this trigger feel so much better. Consistently breaks at 3lbs. The wall is defined and crisp with a great audible reset. I normally don't like swapping out the striker springs and trigger spring but I wanted to see how it shoots. I'm hoping no light primer strikes. Won't have time to go test it for a few weeks.
Right out of the box, I was getting roughly 4.5lb, removed the factory connector and installed the DOT connector and was getting ~4lbs. I then purchased a TTI grand master kit and swapped all the components in and it completely dropped the weight and made this trigger feel so much better. Consistently breaks at 3lbs. The wall is defined and crisp with a great audible reset. I normally don't like swapping out the striker springs and trigger spring but I wanted to see how it shoots. I'm hoping no light primer strikes. Won't have time to go test it for a few weeks.
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Nice. Competition or Duty/Carry?
Complete 
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How many rounds through it now?
I would want to see minimum 3k rounds before any failures.