Here is my canned answer:
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I hear how Troy makes quality BUIS but how can Troy make quality BUIS when they don't make anything? Now the guy who Troy contracts out to make them, he is the one that make quality BUIS's
Here is how the BUIS I have owned stacks up:
Troy (front and rear)- I have these on my Noveske. They are labled Noveske but they are actually Troy's. They are no doubt quality stuff and the best looking sites out there. They do the job and they do it with good looks. If money is no object then by all means buy these. At $260 for the set though, they are way over priced. Only reason I got them is because they came with the rifle.
Midwest Industries (front and rear) - I like these a lot. You can get them for $160 for the set from a lot of guys online. I like how the front site is a 3/4 circle, makes it naturally easy to line up with the rear. Also the action is a lot smoother than the Troy as they flip up and down a lot easier. I like these so much that I got 3 sets on 3 different rifles.
PRI (front only) - I think this site is an excellent value for $100 (Front only). The circle just makes it naturally easy to use with the rear. Quality is right up there with the best of them. For front site, these are my first choice. I have this on one of my AR-10's.
ARMS 40L (rear only) - I have had this unit for about 3 years now. Back then they were around the same price they are now, wich is about $110. I only used it when I first zero'd. All I can say it is not a bad site, but I don't really like how the flip up action works on this. I have this one mated to my PRI front, and the 2 together seem to work just fine.
Yankee Hill Machine - These go for about $120 for the set and are excellent value. I don't own a set but I have used them before as my buddy has 3 sets of these ;and he is not dissapointed.
Promag (front and rear) - Appearence wise, the front looks like a YHM unit, and the rear looks like a MI unit. These are the best value at $45 each, or $90 for the set. They seem to work just as good as the other sites, but they don't look at as nice and they appear to be cheaply made.
Remember, they are called backup Iron Sites for a reason. Sometimes I think it is kinda crazy spending $300 on sites you may never use... even $160 is crazy, but we are all slaves to fashion, so for fashion sake, it must be done.