What problems have you experienced with "known quality" firearms and accessories?  First hand experience is preferred, but witnessing or second hand info would be good.

I try to stick to the tried and true brands for most things with firearms and I generally subscribe to the "buy once, cry once" mantra.  I am willing to test out more budget friendly things, but usually after I already have one "known quality" on hand.  Like I have a beater PSA AR that was about $400 total to put together that I did so mainly to test with lower powered steel cased ammo. 

I've experienced the following:

1) Aimpoint T-1 not able to zero.  The windage adjustment didn't work.  This was at a rifle class and with a good shooter.  He ended up using the T-1 that I had on my backup gun. 
2) Trijicon Accupoint 1-4 adjust POI on anything other than 1x.  I don't recall what the explanation was, but it was sent back to Trijicon and they fixed it.
3) Aimpoint Comp M2 just quit.  Tried new batteries, etc, but nothing.  This was also at a rifle class and he ended up using the T-1 that I had on my backup gun.  [my backup gun really "saved" a lot of folks]
4) The safety lever arm on my LMT broke off about mid way through Day 1 of a rifle course.  Gun wasn't dropped or abused in any way.  It was still pretty new at that time and probably about 1000 rounds. 
5) The glass panel reflector/refractor (or whatever it's called) on an EoTech EXPS2 came loose. 
6) BCM midlength upper with A2 FSP out of spec.  I was able to zero the irons, but the rear aperture was maybe 2 clicks from the end.  Technically ok, but BCM said to send it back to them and they corrected it. 
7) DD lower from a complete DD M4 V5, the screw for the pistol grip was such that installing other "standard" grips would leave a gap.  Even A2 grips from other "milspec" guns.  Sent lower back to DD and they ended up bubba'ing my grip by filing the hole to fit. 

Elf Trigger (Match) having light primer strikes.

Called Elf and Art Sr. himself helped me.  He sent me a new one.  Haven't fired it yet.

Two Viridian Green Laser Sights, model C5L, started displaying a large starburst pattern instead of a dot.  The green light on the target/wall looked roughly like the Milkyway Galaxy.

Sent back to Viridian, and they quickly fixed the problem and returned. 

I don't normally practice with the laser attached, so the concussion of firing the gun should not be a factor.  I do, however, use them to play chase with the dog and cat, which is why I noticed the problem in the first place. 

Two Viridian Green Laser Sights, model C5L, started displaying a large starburst pattern instead of a dot.  The green light on the target/wall looked roughly like the Milkyway Galaxy.

....
Mount it to a shotgun

....
Mount it to a shotgun

While you're bullshitting, I already have one on my KSG!

Not sure my slugs and 00buckshot will pattern like the laser, though.   

My Trijicon SRS crapped out twice and got fixed twice for just the cost of shipping it to Trijicon.  Relatively low 5.56 round count each time it shut down.  I treated it just like how I treat all my other firearms and optics...   I sold it after it got fixed the second time. 

Also had a Primary Arms T-1 clone shut off when it was being used on a 9mm AR.  Amazon got me a replacement which now sits on an airsoft gun. 

S&W 625:
1 - The mainspring tension screw has a tendency to back out over time, ultimately resulting in light primer strikes and endless failures to fire.
2 - The screw holding in the cylinder release lever rattled loose.
3 - The extractor rod worked loose, jamming the cylinder closed.
Solved #2 and #3 with LokTite; #1 is a recurring issue.

HiPoint 9mm carbine: broken firing pin. However, the gun continued to operate with like 80% reliability!

H&R single-shot shotgun: broken firing pin. They're known for this.

Beretta Neos: soft steel in several of the trigger components yields rounded edges and decreased reliability over time.

Browning Challenger II: single-point mounting screw for the rear sight shoots loose.

RIA 1911: parkerizing not very robust. Prone to rust with little provocation.

Years ago I was a member of Washington arms collectors.
Some of my guns are inherited, and the ones I purchased were
"Eclectic".
I do not own an AR platform.
I've fired hundred of thousands of rounds.
The only problems I've had was due to ammunition
failures not guns.  My S&W model 940 is picky if you use
hot ammo.  Run for the Internet.  The 940 is a 9mm wheel gun.
Great for ladies.  If you can find one they run 6-8 hundred dollars.
Had they been available in the day I'd choose an LC9,
But the S&W 940 doesn't leave brass behind.
That is important in anti gun Hawaii.

Elf Trigger (Match) having light primer strikes.

Called Elf and Art Sr. himself helped me.  He sent me a new one.  Haven't fired it yet.

Saw your other post on that.  Great customer service is definitely an quality of a company that will quickly earn my business.  Especially how and when they take care of you when things aren't right. 

Two Viridian Green Laser Sights, model C5L, started displaying a large starburst pattern instead of a dot.  The green light on the target/wall looked roughly like the Milkyway Galaxy.

Sent back to Viridian, and they quickly fixed the problem and returned. 

I don't normally practice with the laser attached, so the concussion of firing the gun should not be a factor.  I do, however, use them to play chase with the dog and cat, which is why I noticed the problem in the first place.

Haven't heard of that brand.  One of my buddies has a green laser for his Sig 2022 and I think that might be the one.  I've never shot with the laser though. 

What did they say was the problem? 

My Trijicon SRS crapped out twice and got fixed twice for just the cost of shipping it to Trijicon.  Relatively low 5.56 round count each time it shut down.  I treated it just like how I treat all my other firearms and optics...   I sold it after it got fixed the second time. 

Also had a Primary Arms T-1 clone shut off when it was being used on a 9mm AR.  Amazon got me a replacement which now sits on an airsoft gun.

Did Trijicon say what happened to the sight?  I don't own any Trijicon optics, but I always thought they were pretty good quality.  Seems like the MRO has gotten good reviews. 

S&W 625:
1 - The mainspring tension screw has a tendency to back out over time, ultimately resulting in light primer strikes and endless failures to fire.
2 - The screw holding in the cylinder release lever rattled loose.
3 - The extractor rod worked loose, jamming the cylinder closed.
Solved #2 and #3 with LokTite; #1 is a recurring issue.

HiPoint 9mm carbine: broken firing pin. However, the gun continued to operate with like 80% reliability!

H&R single-shot shotgun: broken firing pin. They're known for this.

Beretta Neos: soft steel in several of the trigger components yields rounded edges and decreased reliability over time.

Browning Challenger II: single-point mounting screw for the rear sight shoots loose.

RIA 1911: parkerizing not very robust. Prone to rust with little provocation.

I haven't shot my RIA 1911 much.  I'll keep an eye out on the finish.  I keep it stored in one of those silicone treated wool gun bag/sock things.  I should take it out and inspect as I don't even remember when I had it out last. 

Haven't heard of that brand.  One of my buddies has a green laser for his Sig 2022 and I think that might be the one.  I've never shot with the laser though. 

What did they say was the problem?

They didn't say why or how it happened.  When I first called, the problem was the laser wasn't even activating with the ON button.  Just before I shipped it, I tried again with another new battery, and it came on (of course).  But, the "star field" was still an issue.  I called and updated the RMA work order. They sent it back with no button or star field issues, and it's still good.

When it happened on another laser, I tried cleaning it per the user guide.The star field turned into a much smaller halo around the dot, so I'm assuming dirt/residue from shooting was the original issue.  No matter how much I clean it with alcohol, the halo remains.  It's tolerable and useable, but it's annoying.

The warranty that came with it was for 12 months, so I'm sure it'll cost me to send it in.  I'll keep using alcohol and Q-tips.  Maybe it'll wear the halo down.

EDIT:  I checked online, and the warranty page says their products have a 7 year warranty.  I'll have to find my receipt (my desktop PC is off now due to a warranty exchange for the CPU liquid cooler in process) and call Viridian.  Hopefully they can remedy the issue with the dot/splotch.  BTW, they send a shipping label, so you don't pay to ship to them under warranty.   

A few years ago, I bought a Zeiss Conquest 3-9x40 rifle scope from Midway. After two brief range outings, the windage knob quit working.  Called around and was advised by a terse CS rep at Carl Zeiss Sport Optic to mail it to them. . I did, and heard nothing for  many weeks. After I emailed requesting an update, someone finally replied,, blaming "delays with the factory" and offering  a Zeiss Terra 3-9x42 replacement. Their email did not mention that the Terra was a  cheaper substitute  for the Conquest line.  By that time, I figured I better  cut my losses, so agreed to take the replacement.. I finally got it,  six months after I mailed the original one to them and only after minimal service from their CS department.  No more Zeiss for me.;

A few years ago, I bought a Zeiss Conquest 3-9x40 rifle scope from Midway. After two brief range outings, the windage knob quit working.  Called around and was advised by a terse CS rep at Carl Zeiss Sport Optic to mail it to them. . I did, and heard nothing for  many weeks. After I emailed requesting an update, someone finally replied,, blaming "delays with the factory" and offering  a Zeiss Terra 3-9x42 replacement. Their email did not mention that the Terra was a  cheaper substitute  for the Conquest line.  By that time, I figured I better  cut my losses, so agreed to take the replacement.. I finally got it,  six months after I mailed the original one to them and only after minimal service from their CS department.  No more Zeiss for me.;

That's messed up to get a replacement that is lower on the line.  Did you try going back through Midway?  I generally avoid Midway due to their shipping policies as well as some other stuff in the past. 

I haven't owned a Zeiss, but I've shot some bolt guns with some nice Zeiss glass.  However, if their CS is like that, screw them.  Plenty of other excellent quality optic companies with even better CS. 

I buy only name brand manufacturers products that I know I will get quality CS and service. Also, I buy from vendors like Amazon, Brownells, and MidwayUSA because if or when I have a problem or issue with the product I buy from them they will resolve it, period.

I had issues with XS Big Dot sights and Surefire weapon lights and all went well with returns or replacement.

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I have a S&W Model 547 which the tension screw for the hammer spring backs out after a few years and needs retightening. It gives me light strikes. I am sure a little blue locktite would fix it.

I have some Lee reloading equipment which I am always ordering plastic parts that wear out regularly. Lee doesn't warrantee the plastic bits.

I bought a Holosun red dot sight and the mounting screw broke. Their CS was great and they replaced it it immediately.

Ruger MK I, II and III .22 pistols are easy to disassemble and a real bitch to put back together. The MK IV is a huge improvement.

I have two High Standard .22 target pistols that have gold plated triggers and the plating corrodes and flakes off causing sticky trigger. It has to be taken apart and cleaned when this occurs. As well as the return spring needs to be replaced every 5 years or so. target guns can be finnicky.

My friend has purchased a S&W Model 686 used and is an older model with a firing pin. And the firing pin broke. S&W replaced it at their cost. He also purchased a used Ruger 45 auto of some sort that never worked correctly. It wouldn't feed reliably and would have light strikes. He sent it in to Ruger and they fixed it at their cost.

There are lots of other things but mostly involving known low quality and cheap products.

Inspector - What gun did you shave the Holosun on? I don’t own one, if I’ve seen the mounting bolt shear off on a couple of them that were used on 5.56/.223 ARs.

Inspector - What gun did you shave the Holosun on? I don’t own one, if I’ve seen the mounting bolt shear off on a couple of them that were used on 5.56/.223 ARs.

I put it on my 9mm AR. I set my fat wrench to 10 in lbs and tightened it. It sheared off while shooting. The sight comes with a low and high mount and they use the same mounting screw. So I replaced the broken screw with the other screw and it held fine. It was nice that CS didn't even ask any questions, they just sent the replacement.

I have since removed it and sold the upper. But I plan to put it on my 300 BLK AR.

I put it on my 9mm AR. I set my fat wrench to 10 in lbs and tightened it. It sheared off while shooting. The sight comes with a low and high mount and they use the same mounting screw. So I replaced the broken screw with the other screw and it held fine. It was nice that CS didn't even ask any questions, they just sent the replacement.

I have since removed it and sold the upper. But I plan to put it on my 300 BLK AR.

I see.  So a pretty soft shooting gun.  I don't have a Holosun, but I know many folks who do and I recall generally positive responses.  Though the mount screw breaking is something that I noticed.  Easy fix, but seems like something that they should correct out of the box.