The optic was mounted pretty tightly hardware (bolts) didn’t break. They are still in the sight threaded To the mounts of the slide. It was threadlocked and torqued to the spec recommended the he sight manufacturer. I don’t think it was more than 16 inch pounds. There were over 200 rounds fired from this particular gun since the red dot was mounted. It just seems pretty interesting to me.
Ok so that's what I was seeing. The picture of the bottom of the optic, the hardware didn't look like a shear failure. Well that because they didn't break. So the the threads on the slide gave out which now I see. First thoughts where there could be a few things (knowing your skill set neglecting installer error), I would say slide metal is too soft(least likely). Holes machined slightly off to get hardware in but introduce a side load enough to rip them out over time ( I would put this in the moderately likely). Lastly the thread pitch/pattern was wrong. If their CNC wasn't using a tapping bit but rather than one of the universal threading bits that carve the threads through CNC action (I forgot the name of the bit). My guess is both the holes were slightly off and during test fitting found the problem, then slightly over sized the holes/ threads allowing the optic to mount. But because of the loose fit there wasn't enough metal in the slide threads they gave way with the force of shooting.
The mounting nubs of the slide are still in the sight on the screws.
Hmm. That is interesting, ill be curious to hear what rockslide has to say. They will probably want you to ship them the slide in the optic to investigate.
I hope so, they are only 60 miles away from me I could actually drive the parts up to them and drop them off in person.
Missed that tidbit. Yup shitty metal or opened up the thread so much that it didn't have enough metal left to resist the shooting force. Wait just had a realization did the screws go into the slide at all or just the lugs? If not it in the slide then that would be a huge issue.
For the technical addicts, minimum thread engagement is
www.allacronyms.com
I get what you are saying but I don’t think this is the case. The threaded nubs which broke off stick up about 1/8 th inch from the slide (which are still in the sight attached to the screws). They are threaded all the way to the base The flat surface in the picture. The screws were Threaded all the way in to the sight mounts bottomed out and were too long to tighen the sight to the slide. I pulled each screw out shortened it a couple of threads to tighten the sight to the slide.
They were bottomed out into the mounts then shortened to get proper tightening to the slide. The screws which came with both the slide and the sight were too short so I had to buy longer ones and cut to fit.
Sadly I think they will claim you over torqued them. I know you didn't but that's my guess how they will play this one.
Maybe and if they do they do I will need to get some collared bolts to mount the sight and run a thread chaser down slide mount holes to clean them up. Either way it is fixable. I find it interesting the Glock 22 slides on their website no longer have the nubs sticking up. Maybe it was a design flaw they caught and adjusted.
Probably did. Glock uses M3 bolts and 16 inch pounds is overtorqued for all but the highest strength bolts (property class 10.9 or 12.9) and then it is a significant percentage of the yield strength with little margin for error, or material defects. If the replacement bolts were property class 5.6, or cheap ass Chinese shit they were way over torqued.
But the failure wasn't with the hardware, which was my first take also. It was a base metal failure around the mounting studs. So it appears in the top photo the lug had god engagement, but the screws didn't protrude into the slide itself. So all the load was transferred through the stud right at the shear point. And not to mention these screws were longer then what was provided. Really dumb on the manufactures part.
Lol.
That is excellent customer service, glad to hear it man.
Nice, sounds like great customer service. I have only 1 complete slide from Rock, good to know they stand behind their product if I ever need help.
