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Backup irons are good for way more than just close quarters. A rifleman of average skill level should be able to nail a torso shot with irons out to a couple hundred yards.

Maybe, but I'm not willing to take that risk. My primary has offset irons so that I don't even have to waste time removing the optic.

lol somehow I knew you were going to say you used to carry a SAW. 10+lbs isn't horrible, but when you can build a significantly lighter AR for less money than you spent on the build you posted, it just doesn't seem practical not to. That's just my take on it though, and I'm just some douche on the internet. My primary rifle is about 8lbs fully equipped but unloaded. 2-3lbs doesn't sound like much, but every little bit counts imo. My lightest AR is my recreational backpacking build, at about 5.2lbs fully equipped (sights, light, red dot, sling) but unloaded. Carrying that thing is a breeze.

There are a lot of good lights out there, it all depends on how much you want to spend.

On the high end is stuff like Cloud Defensive or Surefire or Arisaka, which all the Gucci gun fags suck off endlessly, but once you get it all set up with a tape switch and all that, you're looking at maybe around $300-$500+... for a fucking light.

Streamlight is far more affordable, but some seem to disregard them as not "good enough". My experience is that Streamlight makes great lights. The TLR-1 HL ($140ish) is solid, but the tape switch for it is crap, but is also really not necessary. The Protac HL-X ($120ish) is great, and has a good tape switch, but is a little heavy, but not really any more than a Surefire light. The Protac is a great deal for the money.

If you want a very bright, very light weight light on a low budget, look into the Nitecore MT10C, paired with a 1" light mount, such as the Arisaka M-lok light mount. This combo will run you about $85-$95 total (unless prices have gone up recently. There are also cheaper mounts out there), and is maybe one of the best bang for you buck options. I can't guarantee that this light is as durable as some of the more expensive options, but the ones I own, and have beat on some, have held up well so far. I haven't tried the tape switch for it, but it looks like shit. Generally, I'm totally fine with simply pushing a button on the tail cap of a light. This is not a long range light, but is super bright at short range.

There are a million lights out there, and a million videos testing and comparing them if you want to do some research.