I’d bet the grove in the trigger pin was binding on the slide stop.
It would not be the 1st time I have seen this happen.
Just an update of my Gen4 G17. I will say right now, that my experiences are only a single sample, so take it FWIW.
I cannot really account for what the issue was in the pistol. Perhaps something fouling the recoil spring assembly perhaps as the dual recoil does have tight fit design as far as the springs themselves, but I cannot say for sure what the issue was. I am sure that the slide stop spring was fit under correctly but at this point I still cannot say for sure what during that 300 round period caused those issues.
I will say that I am pretty much 110% it isn’t my own grip and the extended release as I run all my Glocks in this manner and the problem has not resurfaced since and I sure as heck haven’t changed up my grip.
Since the last posting I started a torture test at 3250 round count mark. It was the standard torture test posted right here at M4C, where I cleaned the pistol completely and lubed it with Break Free CLP. Instead of 2K rounds I went to 3K rounds with no cleaning or lubing. Not a single issue and I am quite sure it would have kept on going for quite a bit more. The test took 10 days with 5 days of actual shooting. The test ended at the end of July. From Mid April when I got the pistol to the end of July the pistol had 6250 rounds through it at the end of the test.
Since the end of the test at he end of June, I cleaned, lubed the weapon and shot a video. Since that time I decided to run another back to pack torture on the pistol and so far I have put another 2250 rounds through it without lube and or cleaning and I am up to 8500 rounds total. I am still on the stock recoil spring and nothing else has been changed since the 3.5 connector, extended slide stop and a .25 cent trigger job. Again not a single issue so far. I am not sure how far I am going with this torture test, but I originally wanted to shoot for 4K rounds. I have a 10 week period coming up very soon where I will not be able to shoot as often, or will be relegated to shooting mostly another pistol predominantly so we will see.
In any event, I have several video’s of this pistol in action and an AAR on it after the 6250 round mark. The below video is a compilation of several video’s, so if you are interested in seeing more of those videos in their entirety you can check out my channel. I will also have a Battlecomp review upcoming as Capt Nick was kind enough to send me a couple test units. I know the BattleComps aren’t exactly fresh of the boat right now, but I only recently had time to get to them.
Anyway here is the compilation video with my AAR.
http://www.youtube.com/watch?v=FTVX8TUCVe0
Excellent review and video. This is why I come to M4C, people actually shoot here. Look forward to more reviews and video. 
Surf - great vid and review. I was especially impressed with the speed of the weak hand hits and the speed of the strong hand only 6 shot string. Good stuff.
Exactly.
Glad your gen4 has ironed itself out, JMHO but I think the intermittent issues are the dual-spring, they’re flimsy and inconsistent and seem to change a bit depending on how they’re orientated upon installation, wonder if they don’t just add more downside then upside.
Anyways, nice shooting.
I have four Gen 4 Glocks and have not found the spring to be flimsy at all.
I have four Gen 4 Glocks…
You rock dood…
Funny…my Gen4’s are all I seem to shoot anymore. I wish I could bring myself to unload all the dead weight in my safes, but I guess I’m just an ol’ softie…
Tagged for follow up. Keep us posted
+1, dang for sure
Thanks for the comments and glad you guys enjoy the video’s! Shooting video is a great way for me to see my own issues that I need to work on and if they help others, bonus!
I will just say that I have slowed down shooting this Gen4 G17. I am over 9K rounds on it and besides the extended slide stop, sights and connector, everything else is still stock, no spring replacement either. This is not a duty or defensive weapon so I am going to keep running it as is. Besides shooting a lot of rounds out of this pistol, I still must maintain my training on several other weapons. After finishing a 10 week evolution at the beginning of the year, I was out on the range quite a bit and a lot of my time for the past 4-5 months was doing a lot of shooting.
Unfortunately I am entering another 10 week phase starting Monday, so my own personal shooting will slow down quite a bit and I will have little time for weapons that are not a part of the program. I will be extremely busy and will be tied up during this time frame. So for those who watch my video’s they may slow down over the next 10 weeks. Actually I am going to be pretty tied down until after the new year and it isn’t going to get any better time wise for the next 14 months or so.
I will update when I get a chance to shoot it more.
Dang. So what will you be shooting that IS part of the program? 
Nothing too fancy. Our primary weapons during this 10 week program is;
Pistol - Sig Sauer P226 .40S&W
Rifle - Colt M4A1
Shotgun - Benelli M1 Super
We have a few other weapons in the arsenal but that will come later down the line if these guys successfully complete the program and progress onto the teams. But these are our 3 primary weapons.
Damn I need to remember to put on more sunscreen throughout the day. 