I'm skeptical of any $150 RDS. I'd take that $250 I would have spent on BUIS and add it to the $150 I would have spent on a Chinese import and buy an Aimpoint PRO.
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"Might" being the operative word. Maybe someday the Primary Arms offering will prove itself to the same extent that Aimpoint has. That's the point, someday, that I'd consider going that route. If it's the only sighting system on my rifle, I want it to be one of proven reliability and durability. The fact that Primary Arms stands behind it with a lifetime warranty could just as likely be a business decision rather than one that actually reflects the durability of the optic. If it costs them $50 to import from China and they sell it for $150, they can afford to offer a lifetime warranty.
For me, cost isn't the consideration. Reliability is.
I like MBUS Pros when it come to back up sights for their very small profile.
i'd say for a range toy/bug out, i'd put magpul mbus gen2 (yes, the polymer ones). I'd recommend Troy, DD fixed, LWRC skirmish but considering price, it doesn't really fit the "range toy" aspect of your gun.
So why the magpul mbus gen2? Because they're on the cheap side (range toy), and I read about a buis drop test where an AR was dropped with buis hitting the ground first, and magpul mbus gen2 were the best performer (bug out). Quick google search for buis drop test will get you the article
Troy's have never failed me or bent on me. Magpul MBUS 2's would be my second choice as they have also proven to be very reliable for me personally.
Cant go wrong with the MBUS Pros. You can find them pretty cheap if you shop around.