V188,

If you want a rail put on the top, we can do that by special order.

We didn't make it standard, because  cooling is much improved without it, and frankly the optics are more secure when mounted to the receiver.
I realize that in your case with the Eotech, that forward is good, and there aren't any cantilever mounts that allow  forward mounting off the receiver, like the Aimpoint.

We can provide a full length or partial rail on top at an additional charge, and it would take a little while for us to custom make it. However the top rail is not going to be a continuous addition to the receiver rail like some systems. It is at a lower level on the FF tube.

Regarding return-to-zero, it works very well because there are no screws holding the barrel in.
The barrel is held by rotating cams which apply the exact same tension on both sides of the barrel each time you remove/replace it. No POI changes from varying torques on screws like the other systems.

Accuracy is excellent when using the QCB, and there's a post on the ABS barrels EE ad, in which a user had a QCB with a carbon-fiber 11.5" suppressed barrel on it at the prairie dog town. He won a bet that he couldn't shoot a MOA group at 100yds with that gun. He proceeded to shoot a 7/16" 5-shot group off the bench with it.  Of course it was a great barrel, but that barrel had to be secure in the receiver to shoot that kind of group. The MGI QCB works very well.

At this time, the MGI QCB really is the ultimate upper because it really accomplishes what the others only tried to do. It is the fastest, and the most accurate switch barrel upper for the AR.
However, we didn't go to a fancy rail system, in order to keep the price affordable for more people.

I hope that is understandable, because there is always a conflict between making the product fancier, and keeping the price down. We had to make a choice, and we decided to make a less fancy rail/tube system, and keep the price as low as possible.

Flrich,
I'm the factory rep on the board here for MGI.
We can also provide a wide variety of barrels that will work as a package with your MGI QCB system. In a wide variety of price ranges too. Including the ABS carbon fiber barrels.

Regarding your desire for pistol caliber options, we are about to introduce our new MGI Modular Lower Receiver, which will have interchangeable mag-wells for different calibers. Also, our upcoming new version of the MGI QCB will have internal mods for accepting wider mags like the AK47 mags. The initial release will have interchangeable magwells for AR15 and AK47 mags. 9mm and 45ACP will follow. Then a wider variety of magwells permitting the use of normal magazines from a variety of guns for a variety of calibers, including pistol calibers and rimfire calibers, and other rifle calibers.

Existing MGI QCB uppers can be modded to meet the new specs for use with the modular lower AK magazines.

Barrels for nearly any caliber you want can be ordered, or may even be in stock.

There will be no need for "franken-mags" or mag blocks with this new system. Also, we have a new design for using pistol calibers, so that the fire control group won't have to be changed when you switch to these pistol calibers in our system.

It's an exciting new system for the AR, which offers options that have never been available before to AR owners, so easily and quickly.

You can contact me using the info below in my sig line.

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