45 Degree Offset Backup Iron Sights By Ozark.
920546
I am pleased with the sights and the price was unbeatable. I have mounted them on my DP-12 shotgun.
3252578
I don't like having objects protruding from my weapons, but when using digital optics, it's nice to have backup iron sights in the event the batteries fail.  These offset sights do the job and are reasonably easy to align.  I have purchased several sets and recommend them for defense arms.
91642
This Aim Sports "Dual Aperture Rear Flip-Up sight" is decent quality and works well as a backup to my rifle's scope.

Pros-
+ Quality; good "fit and finish"
+ Accuracy; easy to adjust and holds "zero" between trips to the range
+ Appearance; looks good on the rifle

Cons-
- Stiff; the transition from down to up is a little gritty at first but it did get better with a judicious application of oil

This is a good choice for my needs in a backup sight.

Recommended!

CFH
4526995
Nice sights, almost identical to an AR15 sight picture. I went with the TSR 100 sight for simplicity. I did not need or want elevation and windage adjustments on the rear sight. Easy to follow instructions with included allen wrenches and thread locker. Front sight post can be replaced with any AR15 front sight. The only criticism I have is with the rear aperture. To my eyes both the short and long range options seem to be about the same size. I will take a round needle file to the to open up the close range sight setting. Other than that great option for iron sights.
195072
These flip-up iron sights are simple to install and they seem durable and well made. I was able to sight them in with my bore sight before taking them to the range and was glad to be on paper at 100yards with only a few turns of the adjustment knob on the rear sight. They also co-witness with my holographic sight and laser attachment.  We will see how they stand up to the test of time. I plan on trying more of Ozark Armament's equipment in the future.
2097277
Fit is perfect and includes two spare screws.

Solidly mounts to the gun and appears well made.  Highly recommended.

As with the factory rail, this one make using the iron sights impossible.
3380428
I have this canted at a 45 degree angle on my AR right next to my Vortex Viper. This is worth every penny.
1282639
The sights were shipped out and received very fast. I like the look and feel and also the snappiness of these iron flip sights. Haven't got them out to the range yet but so far pretty happy.
3085488
Great back up sights for the price I am impressed by how well they feel and how solid built they are so I will order another set.
3452954
This sight was easy to install and works as promised. I have used these sights in the past and they never dissapoint. It is the quality I expected.
1711529
Great iron sights.  I do wish they popped up with spring assist when you push the button,  they simply lift to place, no unlock necessary  which is cool too.

The rear sight has a second peep hole, a smaller phone, which flips easy.

The only issue I have is, the front sight is a bit difficult to adjust even with the troy tool. Also, this package comes with a tool. But yes a bit troublesome and stiff.

Other than that, they work great
2309589
Great product.  Allows me to keep a tight package with optics and iron sights.
I use them with no problem in a lefty setup.
3910146
Used to mount a Bushnell TRS-25 Red-Dot on top of my AR, cowitnessed with iron-sights (A2 front sight and Magpul BUS rear sight). Worked perfectly.
1121519
This is a cool and solid product. Fitment is great and solid. Once mounted. It stayed where I put it. Nice positive push button transition. Works nice as its intended purpose. Back-Up Sights:)
3227346
I bought this scope last fall for my M91/30.  Originally I was going to remove the rear sight and mount the scope as recommended.  However my rear sight was soldered on, and I like having iron sights.  So I made a homemade bolt on mount bracket to mount the scope.  I punched out the two pins on the bottom of the factory rear sight, and the pin for the sight leaf.  Then I made an angle bracket with 3 holes, one for each pin hole in the rear sight.  I used 4mm diameter socket head cap screws to bolt the bracket to the sight, then I bought a scope rail for the top of my bracket.  Then I mounted the sight on the scope rail.  The whole setup is a little bit tall, but it works great. I notched the homemade scope bracket so I can still ramp the rear sight leaf to 800 meters.  I've fired several boxes of ammunition now and the scope mount is not coming loose, and the scope is working great.  The picture is very clear, and the scope is holding its zero.  I haven't had any problems with glare either.  The eye relief is plenty long for the M91/30.  It takes a screwdriver or coin to adjust, but it seems to have plenty of adjustment range.  I've looked through the scope in low light conditions, and picks up enought light to see the reticle.  This will allow the scope to work for deer hunting around sun up and sun down, which is the real reason I bought it.
31958
Fun to see down range.  Helps when using only iron sights.
3347326
Mine flips down to allow clearance for a night vision scope right on top of it. The scope is QD, so in daytime the Iron sights are my primary. I like the way it works, it isn't elevation adjustable but I just do "Kentucky windage" for that anyway, so its one less dial to accidentally spin.