Copied from my Emag History lesson on X7OG.net:
The E-Mag, a beautiful marker. It was one of the orginal electronic markers. AirGun Designs Produced it.. For those of you who dont know...AGD is NOT out of business. Heard of the Tac-One?? They make it.
http://airgundesignsusa.comThe E-mag is also the only marker (to my knowledge) that can switch between fully electronic to fully mechanical (meaning the electronics dont fire at all, they are shut off and the gun operates mechanically, no solinoid, board or batteries). It also has a mode called "Hybrid" which is insane awesome. With the electronics on, you would move the selector switch from E to M. It would use the solinoid and the "RT" effect of the X-Valve to achieve electronic "bounce". This achieved very high rates of fire that were unheard of at the time. When new, it cost $1000 MSRP.
It has several variants, the X-Mag, E-Tac, SFL E-Mag, but its all the same functions, just different bodies. E-Mags dont have eyes, they dont need them. The E-Mag uses a bolt called the LVL 10, which, when tuned right, wont chop paint...at all. Some E-Mags (I believe the SFL and XMag had Eyes that worked with the LVL 10, Mag eyes are called ACE...respectivly..Anti-Chop Eyes)
Heres a properly tuned LVL 10 on an E-Mag shooting full auto:
http://www.youtube.com/watch?v=u-OwVRD2SOEHeres a pic of mine:

In a nut shell, Smart Parts threatend to sue the AGD about the E-Mag, saying that they own the rights to any electronic board used for paintball. Something like that. So AGD stopped producing the E-Mag. Now the E-Mag is a coveted relic among Mag users, as it is the pinnacle of all AGD markers. You can still find base E-Mags for roughly $500-$750. Custom E-Mags (including the SFL and XMag) sell for much more (roughly $1000-$1500) The Tac-One is the E-Mags little brother..it offers no electronics, but can accept a mod called the "ULT" (Ultra Lite Trigger), which in effect makes the marker walkable if tuned right. Ive confused may a speedball player with my Tac-One, as if you walk it right, it can get up to 12-15bps easily, with no electronics.
Tac-Ones can still be purchased directly from AGD and are AWESOME markers. I own a Tac-One and the E-Mag. Both amazing. Not very air efficient, but that doesnt matter to me, I have an 88/4500 tank I use