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It's nothing massive but it's certainly noticable. The weight is off on AEGs to, if you want something realistic them a PTW is the way to go (other than a TM recoil/ERG/GBBR). If your used to using a real AR15, like the op, then having something with the same balance and size etc would be a benefit compared to a normal airsofter who hasn't used one.
My personal choice would (and has been) be a TM recoil or a G&P if on a smaller budget but the op did say he wanted the most realistically feeling rifle and excluding GBBRs, a PTW is the one to go for- granted there are CTWs and DTWs but they'll fall apart/need parts replacing with real systema ones anyway.
If you like the recoil effect - TM recoil shock, if you dont want recoil - VFC with the internals replaced with Lonex and a mosfet. My tuppence worth anyways.
It's about 4-5mm, definitely noticeable to the eye if you put two next to each other.
Experience with a real AR15 was a 6 week exchange with the US Navy in 2010 where I put approx 2,500 rounds through a variety of M4/M16 platforms. Have also handled (but not fired) the L119A1 SFW and the L129A1.
AEGs are in no way as realistic as they appear, everything from weight distribution to the feel and finish of the materials is normally 'off'. It doesn't bother me really, but if you've got experience of real AR platforms and want realism; like the OP, you'll notice the difference.
Thanks, even though I do love the recoil. But the weight and dimension must be very very close to the real thing. I am actually thinking of doing the mod of my real AR15 on to the Systema, when I get it. So it will be almost identical. I might go to Project PTW as advised, or I might even take it to the custom gunsmith ( http://www.lannertactical.com ) which I had my real AR15 done. So they can put the same mod onto it.
Be nice to see a few pics of the modified AR you have, have been thinking about one myself in .223 for target use, as currently I just use a Sako (as my username suggests), what twist rate/grain weight you set up to?