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They’re the same
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Apolopgies for this wall; I'm literally autistic, and guns have been one of my particular areas of interest for, um, 40-odd years.
That style of hand guard, AFAIK, doesn't accept M-LOK or keymod accessories. I can't be sure though; what you'd be looking for is something like this -> https://www.aeroprecisionusa.com/ar15-atlas-s-one-m-lok-handguard The slots are what the M-LOK mounts go into. (Aero Precision is kinda pricey, IMO.) The added benefit is that it floats your barrel; it's only connected to the upper receiver, and not the barrel, so you can get slightly better accuracy out of it.
You can get the metal parts of the rifle cerakoted white, if that's of interest to you.
You can get a gas block that fits under your hand guard. That allows your hand guard can go all the way to the end of your barrel which gives you more options for mounting accessories and hand positioning. Gas blocks come in a variety of styles, but a fixed and pinned (e.g., held on with a roll pin) block will work for almost everyone. An adjustable gas block may be better for people that are running silencers, since that affects gas pressure in the system, but I have no direct experience with them since silencers are $$$. If you replace the hand guard with an M-LOK hand guard, you'll need to replace the front sight with a low profile gas block.
I'm personally not a fan of iron sights because my eyes suck. I use an LPVO and a canted red dot, and that's worked very well for me. I can reliably hit targets out to 340y (or, that's the longest I've shot to, and that was at a match), and there's no way in hell I'd be able to to that with irons.
FWIW, AR-15s are basically like Legos for adults; they're almost infinitely modular, and most parts work just fine with other parts as long as they're from reputable manufacturers.
I don't know about Olight adapters specifically, but I've seen LEP heads for Surefire bodies. IIRC the Blazer LEP Z-Bolt is good to at least 300y, and it's bright. There's very little spill; it's very, very focused. I've shot out to 150y with a Streamlight ProTAC; it's not great at that distance, but it works. It's got a lot of spill and decent throw, so you still have peripheral sight.