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I'm guessing he's talking about a magnifier

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I've posted this before so I might as well post it again.

all of the magnifiers out there are really more for target identification then they are for distance shooting.  You still have to zero your weapon for your expected range of engagement (I zero all mine at 50, so at 200 it should be dead on...or close enough assuming I do my part).  A lot of people think that the 3x mag suddenly allows them to make 600yd shots with their aimpoint/eotech.  While it certainly does make seeing the target easier, you still need to know your holdovers or your rounds are going to hit lower then you intend.

The best analogy I've been able to come up for them, aside from the one I mentioned about them being for target ID, is basically adding a crutch to your optics to give you a little more versatility then just a straight red dot.  Obviously the more easily you can see the target the more likely you are to hit it assuming your zero is correct or you know your holdovers.  The 3x mag and red dot combo is basically good for a 90% CQB/short range (100yds or less) weapon where you need to have some longer range ID and possible shots out to say...300yds give or take a bit.  While it can certainly help you out with those longer shots, it is by no means the best tool for the job.  If you're going to have longer range engagements/targets then you're better off going with an ACOG or other magnified optic.  Of course you sacrifice your up close speed, but with options out there like offset mounts or piggyback red dots you can help close that gap.

IMHO, the ACOG + dot combo is probably the best in terms of versatility out there at the moment.  It too does have it's weaknesses, but I think that it's a better package then a red dot with a magnifier.  I have a magnifier and red dot combo, while I like it....It's not as useful as I initially thought it would be.  Infact it's more dead weight then anything 90% of the time.  

I don't have an ACOG, but I'm highly considering selling a few things and saving up to buy one.  They are expensive, but if you look at the cost of say an Aimpoint/Eotech, a good mount, and a magnifer with mount you're looking at virtually the same price as the ACOG.  I've been using a Po-Boy, so that's a bit cheaper then the real deal magnifiers and even with my optics costing me $250 for 2 M2's in QRPs (price is what I paid for both) and $250 for a 512; I'm still a pretty good ways away from the price of an ACOG with this package.  However it let me play with a magnifier and get a feel for what they'd be like before I sprung for the real deal...and after my experiences with the Po-Boy I'd have to say it's not worth it for the price.  The clones are supposed to be acceptable but with shitty eye relief and mounts, so that's not really worth me spending my money on IMHO.  If you want some more detailed info about what I felt were the pluses and minuses of the magnifiers I can post them up for you...I kinda summed it up in a vague general sense.  If it helps at all for frame of reference, initially with the concept of the magnifier I was all about them and thought that they'd be awesome and really help bridge the gap between a CQB optic and a magnified optic....however I quickly changed that opinion once I tried it out.

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I was just thinking about it and it seems odd that none of the established optic companies have produced a mag compatible with Aimpoint or EOtech sights. Especially in higher magnification than 3X or 4X.