Bought this to install on my Brownell 080-001-303MB 

BRN-16A1 M16A1 Upper Receiver Black.

First thing I noticed is that the roll pin was missing from the package. In too much of a hurry to get it installed to worry about a replacement. I've got pins, we can do this.

Second, as other reviewers have stated, the flat spring wasn't quite flat enough for my liking, making the pin a bear to get through both holes & consequentially also made the sight a pain to flip/rotate.

Third, the tolerances were so tight on the pin (head to roll pin hole) that I had to sharpen the tip of an old punch just to get the roll pin holes to align in order to install the roll pin.

Final result: it LOOKS great, but I have to use a large flathead to adjust it.



Time to tear it back down & do some minor smith work.

Tried to put this on my Brownells 601 upper... but it didn’t want to work... not sure if this was because the upper wasn’t made right, or the flat spring wasn’t made right... so without knowing I have to be nuetral...



The Flat spring curved too high, so the windage screw couldn’t go through both holes.

I had to hammer the flat spring down so the curve was lower (more flat), allowing the windage screw to pass through. But it wouldn’t completely pass through both holes.

I had to press down on the aperture site while I screwed the screw all the way through, so the windage screw head was flush with the upper.

Without pushing down, on the aperature site, the windage screw could not move flush against the upper, which wouldn’t allow the windage drum to align with the windage screw hole to pass the detent through... anyways !!!!

Took me a while to figure this out but it finally worked.

Would’ve rather bought one that worked, but in the end, it worked.

My advice, find one that works, or make this work... but then again, maybe it’s the upper.

The sights work well. They install easy. But the outline of the apertures do not have the same shape as an original. These sights resemble the straight shape of the A2 0-2 sights rather than the circular shape of a true A1 sight. I'm not sure I would use them if a closer match is available.

I had no issues with installing this sight assembly. If the user uses properly installation procedures, there will be no problem getting this to work with any A1 upper receiver.

After fighting with this for over an hour, and reading these reviews, I finally got it installed. The screw was almost impossible to thread all the way through the sight, I lathered it up with grease and was finally able to get it far enough in to allow the sight to be properly installed. Basically rounded off the head in the process (yes I used the correct size bit).

It’s so tight that adjusting the sight requires vice grips and a punch. Also can’t change flip the sight up or down without using a plastic punch and hammer. DO NOT BUY

I couldn’t screw in the screw to the sight, waaaaaaay too tight. I bought a USGI and it worked fine. Don’t recommend, not usable

I've read the reviews and heard about the problems with the tight screw, but I went ahead and bought one anyways, and lo and behold when it got here...it worked. I don't doubt that the other reviewers got bad ones or ones that might've had problems with the screw being at one side of the in spec range and the sight threads being at the other end of the spec range, but whoever made mine did a good job. I just figured I'd write a review since most people don't write reviews for stuff that works. It works.

It was easy to instal. Works great on my retro 601. It works as it should easy to adjust. The only difficult part was putting the tiny pin in. I figured out if I put it in a vice and started pin before assembly into gun it was much easier. Once it was on gun I just had to tap pin into place. I bought two of these and both work as intended.

Much like another reviewer, I bought this sight kit and tossed it in a drawer until I needed it for the build.



The screw is horrendously tight. I almost knicked my receiver trying to tighten the thing.



If I had a tap and die the right size, I would run both the sight and screw through them and then assemble.



I'm going to basically use the screw as it's own tap with the sight itself in the bench vice (padded) and get it smoothed out then install the sight in the upper as others have done.



I won't be buying another one of these.

To start, I ordered this back in september for an A1 build. I should have inspected the sight prior, but I stuck it in a draw till the uppers got in stock. Regardless, I tried to install my LuthAR rear sight assembly today on my upper. I say tried, because as I was installing it there was some major resistance in the first threads. I backed it out, but as I was the head of the screw became wallowed out. Before anybody asks, yes I was using an appropriate sized screw driver. I inspected the rear sight, and the "threads", if you want to call them that were so rough that I wondered how I even got it started in the first place. The entire threads in the sight were very rough and were not uniform at all. Aesthetically the sights are very nice, but my build will not be complete because the manufacture decided not to do a QA check and make sure the threads are clean. I have emailed LUTH AR about this. I hope the next sight set will be properly made.

As other reviews have said... it's super difficult to screw the sight in... but only the first time. This is BY DESIGN because there should be no backlash or wiggle in a sight, so there is essentially no tolerance. The Aperture should "marry" to the leadscrew the first time you thread it all the way. Put the aperture in a vice (NOT IN THE RECEIVER), lube the screw and the aperture, and then thread the screw 100% into the aperture almost like you were tapping threads... go in a full turn or two and then work it back out a turn or so. This will take about 5 minutes. You'll notice that once the screw has been up into the aperture all the way, that the screw is now just barely tighter than finger-tight to turn (perfect). Use a hollow-ground flat corrected sized screwdriver or you could damage the screw slot. Once you have the screw and aperture fitting almost finger tight, install into your receiver or sight base.



I gave it 4 stars because it could be a bit easier to assemble the first time and the finish looks like it could use a bit of WD-40 to remove some very light corrosion.

This is the worst product I’ve ever ordered from brownells, the screw doesn’t fit the aperture correctly and requires so much force to thread that it becomes impossible, you are basically cutting the threads on the screw by assembling this sight. And after install trying to adjust for windage I broke the pin that holds the whole sight together. One would assume that a functional rear sight would adjust for windage, I’d rather burn a $20 bill then buy this sight again.

Bought this for my retro build and the axis screw will not thread into the aperture. The threads in the aperture are out of spec because the axis screw is fine with the other apertures I tried.

I got this kit for an old bushmaster A1 up per I have. The rear sight sitting on it was very hard to adjust and I just didn't shoot it much. With how cheap this kit is I decided it was time for an upgrade. The parts are all new but with mine the finish on the screw and the internal threads in the sight seem to have not taken well and rusted. When I initially installed it I had to turn the screw driver extremely carefully and powerful. I removed it, cleaned it up with pb blaster and a brass brush, and the finish came off the screw and out of the rear sight. Cleaned that off with gun scrubber and then I sprayed some white lithium on both pieces and reinstalled and they went in much easier and now I can adjust the sight very easily. I would definitely bit it again but would clean the parts off first. I may have just gotten a lemon but I'm stilk happy with it.

The infamous A1 sight. These have been extremely hard to get a hold of since they were discontinued by every manufacturer. Here is your chance to get a new one that I believe is a perfect copy of the original Colt. They look more dark greyish like the original color than black color which is listed above.This is a good buy for your retro build and a good deal. These are new quality and fantastic. Don't purchase surplus junk and get burned.