MGI AR15 QCB(Quick-Change Barrel System) GROUP BUY!!!!!!!! **CLOSED**

OKAY, THIS IS WHAT YOU'VE BEEN WAITING FOR, AND NOW IT IS REALITY!!

MGI QCB SYSTEM ON A GROUP BUY!!!

For the next 30 days, we are running a very special price for Group Buy participants.


The MGI QCB system consists of a milspec flattop upper receiver with the QCB locking system and a carbine-length ventilated aluminum Free Float tube with Picatinny rails. No barrel, bolt, carrier, or charging handle is included, and must be provided by the user. We have these additional items available for purchase if you need them, or you could use ones you already have, because they will all fit right on. Picatinny rails on each side and stub-rail on bottom. No top rail.

Very lightweight, the entire upper receiver, locking system, free float tube, and Picatinny rails all as a complete unit, weighs only 1.68 pounds(26.88 ounces)! That's less than some Free Float tubes alone!

It can accept any normal AR15 barrel assembly, minus the barrel nut, delta ring, and handguard keeper. Barrels are not included in this system, but we have many barrels available for those who need some. We have military type barrels, and also the Advanced Barrel System carbon fiber barrels(special order).

The MGI QCB system is the most advanced and fastest quick-change-barrel system available for the AR15/M16/M4 family of weapons. It allows barrel changes in less than 30 seconds, with no tools needed. Return-to-zero and accuracy are excellent, due to the even tension on both sides of the barrel that is always consistent with our cam locking system for the barrel. No uneven tension or torque problems that can plague other systems using bolts to hold the barrel. Reliability is excellent, with a strong steel locking block/cams that provides long wear lifetime, and solid lockup.

The MGI QCB system is also by far the most affordable Quick-Change-Barrel system available, at about 1/2 the price of others. This is THE way to enter the world of interchangeable barrels, for those who are on a budget and want the best item available for their money.

The MGI QCB unit is currently being used by at least 3 different barrel making companies for testing barrels in their facilities. This exemplifies the levels of accuracy and return-to-zero when barrels are being changed many times a day during test firing of precision barrels at the barrel makers.

If you want the best performing unit, and at the least expense, this is the one.


Here are some pics.

MGI QCB receiver unit shown with M16 lower receiver and M4 barrel(lower and barrel not included!)





The Group Buy price for each MGI QCB upper receiver system is $500 each, plus $10 shipping and handling. The Group Buy is for standard MGI QCB only, and no special order modifications will be taken on the Group Buy.

The Group Buy expires 30 days from this date of entry.
Shipping will occur weekly, and orders placed each week will be shipped by the end of the week, or before if we can.

Payment can be by credit card, by calling me at 1-800-307-0728.
If you need to use other forms of payment, you can arrange that by calling me too.

Thanks to everyone, and let the Group Buy begin!

Tom, does the receiver for this group buy have normal or M4 feed ramps? Thanks.

These are the type with the standard receivers, not M4 ramped.

It is important to note that a user only should use the M4 ramped receivers with barrel extensions that are also M4 ramped.

Since only M4 5.56 barrels have this type of barrel extension, having an M4 cut upper receiver can be a limiting factor when wanting to use other types of barrels or other calibers, none of which will have M4 ramped barrel extensions.

So, for maximum versatility with the system, a standard upper receiver is preferred.

If a person is only going to use the QCB for 5.56 barrels, and he can get M4 ramped barrel extensions on all of his 5.56 barrels that he will use, then an upper receiver with M4 ramps can be a useful option on the receiver.

Also interesting to note is that a M4-ramped barrel extension will work just fine in a non-M4-ramped upper receiver, without creating a potentially jamming overlap on the feedramp area.

In most cases where the gun is properly assembled and fits correctly, all the feeding is done directly into the barrel extension anyway, and the M4 extended ramps on the receiver face really don't do anything at all. They only come into play if the mag is loose or feed lips are bent, or some other thing has happened to change the correct feeding angle.

In the circumstances that have been shown in high-speed video, where the last 2 or 3 rounds in the mag get bounced around in full-auto fire and sometimes then get jammed against the receiver face, that was tested with a standard buffer which did nothing to slow the rate of fire, or to keep the gun under better control, like an RRB buffer. That activity would not cause feeding problems of the last couple of rounds if an RRB buffer had been in the gun.

So, for the normal expected use of this QCB upper, with various types of barrels, calibers, etc, it is actually a benefit to NOT have the M4-ramped receiver, because only one type of barrel in the world is designed to work with those ramps in the receiver. And that one type of barrel(M4 ramped) will still work just fine in a non-ramped receiver.

If you absolutely must have this M4 ramped option, we have some QCB's coming in later which will have these M4 ramps in them for the specific M4 barrel extension applications. I don't know whether they will be here before the Group Buy closes or not.

I would recommend against M4 ramps in the receiver, if you plan to use a wide variety of barrels and calibers.

Originally Posted By esskay: Tom, does the receiver for this group buy have normal or M4 feed ramps? Thanks.

a m4 ramped bbl will still work fine in a non-rifled reciever.

Have you heard of anyone using, or know if an offset rail that sits between the standard 12:00, 3:00, 6:00, and 9:00 rails is mountable on your handguard? Planning out the whole gun now and that would be a big help. Thanks.

You can use one of the offset rail mounts that are typically used for that application.
Or it is possible to add a section of rail where you want it by any method that is available to you, such as bolting it on with small screws and backing nuts, or by aluminum welding process.

Last 2 weeks of the Group Buy approaching.
Don't miss out on this.

Now these will work with any AR barrel correct? No modifications need to be made to the barrel?

Very last minute inquiry sent.

Wheredidthatcomefrom,

Yes, the MGI QCB system will work with normal AR15 barrels with no mods.

There are some caveats, though.

The barrel nut, delta ring, and handguard keeper must be removed from the barrel assembly to work in the system, because we have a free-float tube on the system, which doesn't require these items. The barrel nut is not used because the QCB locking block does that job.

So, yes the barrels are normal, but some typical items that come on a barrel assembly will need to be removed, similar to what you'd have to do to install it an a free-float system.

Also, occasionally there will be a barrel that comes along which has an out-of-spec barrel extension that is slightly oversize. These can be used, but may require some hand fitting that can usually be done in about 5 minutes with some light emery cloth on the oversize areas of the barrel extension, so it will fit in. This isn't real common, but it does happen occasionally, so I am mentioning it in the interest of full disclosure.

Once the barrel nut, delta ring, and handguard keeper are removed, and the fit is tested to be sure that it is not oversize, then the barrel can then be completely changed to another barrel in about 30 seconds time, whenever you want, without any tools.

The front sight on each barrel should be adjusted for elevation, so that each time you re-install that barrel, it will be already sighted in and ready to go. If you use an Aimpoint or other dot sight, you can use the co-witness function to check your zero. Barrels typically return to zero very well with this system.

WSmac,

Please call me at 1-800-307-0728.

I cannot return your emails, because they keep bouncing back at me from the Mailer Daemon.
I'll be happy to answer your questions/take an order by phone.

Thanks,
Tom

Thanks!
I saw your IM and replied to you.
I'll try and call you tomorrow.

Only 2 days left in the Group Buy.

Don't miss out!

The price WILL go back up to normal at the end of this Group Buy period.

Group Buy is now CLOSED.

Thanks to all who participated!

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