I would agree that somewhere between 4 and 6 power magnification is the top for a low powered variable that still works well up close - that also matches really well with the effective point target range of a carbine it's likely to be riding on. Sure, 800m hits are possible, but I don't want to try and wrangle an optic into mediocrity on many important aspects in order to improve the zoom level slightly at that range.
I'm with F2S that if somebody comes up with a proper 6x optic with light weight and good eyebox (Swaro comes close, Leupold Mk6 could be a game changer), but until then the prime choices are all 1-4x units like the Short Dot, and TR24T.
My argument for preferring the all-in-one setup is the weight and simplicity, especially when loading it up onto a carbine that already has a weaponlight and IR laser/illuminator unit - making offset sights less desirable...
The primary function is at the low end, where I want something that has a simple dot that can be used quickly up close, then as needed I'll crank up the magnification for target ID or longer shots, and for that even the pricier low powered variable wins.
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Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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