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Posted: 11/2/2005 5:03:03 AM EST
[Last Edit: 11/2/2005 5:03:51 AM EST by ARKAR]
Anyone have any info/experience on the MGI quick-change upper receivers? Were these a success or a failure? Good or Bad? ARKAR

Edited to add a link:MGI Uppers
Link Posted: 11/2/2005 5:04:40 AM EST
Mine is on its way right now. I will be happy to post once I have used it.
Link Posted: 11/2/2005 5:30:37 AM EST
[Last Edit: 11/2/2005 5:37:20 AM EST by twl]
Link Posted: 11/2/2005 6:51:35 AM EST
AWESOME!! Thanks guys!! ARKAR
Link Posted: 11/2/2005 7:36:02 AM EST
[Last Edit: 11/2/2005 7:38:53 AM EST by Bearbait1]

I have had an MGI upper for a few months now. I absolutely love mine. I am currently using it with several length 5.56 barrels, a 458 Socom and a dedicated 22LR barrel.

The obvious comparison is to the MRP. I will say that the looks and finish are a bit rougher than the MRP, but what it lacks there it more than makes up in function. No propriatary barrels. No complicated switching (torque wrenches), and the price was very good. The biggest selling point in my mind is the unlimited choice for barrels and calibers.

As to functioning, it has been stellar. I checked the repeatability last weekend, again, and found that putting my 458 barrel back in, and putting the scope back on, I was only 2 clicks out (.5 moa) at 100 yards, for windage. This reaffirms what I had been previously seeing. Maybe not good enough for shooting a prairie dog at 300 yards, but plenty good for my big game hunting needs. Probably good enough for bad guy situations. And, this was remounting the scope, with the

potential variables there. Not too bad I'd say.


edited: I forgot to add that I shot some groups from the bench with the 300 grain X bullet that were well under 1 moa. I am seeing no issues with the upper adversly affecting accuracy.
Link Posted: 11/2/2005 4:45:08 PM EST

Originally Posted By twl:
There are numerous owners on the ARFcom boards here.
I'm sure some will report.

Also, you can read the December 2004 issue of Small Arms Review, where there is a very good review of the system by respected gunwriter Jeff Zimba, who is also an ARFcom member.

Upcoming articles will soon be seen in NRA's American Rifleman magazine, and another writeup on the MGI upper along with the new Modular Lower receiver system in Small Arms Review.

My own experience with the system over 2 years now, has been one of nice accuracy, good zero repeatability, excellent reliability, and great versatility of use.

It is the very first quick change barrel system for the AR15 ever to use existing standard AR15 barrels, and was way ahead of the pack 2 years ago, and still is.

Designed by the man who designed the M2HB-QCB 50cal quick change barrel system for FN. He knows how to make a quick change barrel system, among other things.

The latest spec QCB from MGI includes internal dimensional changes which will accommodate AK47 mags, when used with our upcoming new MGI Modular Lower Receiver system that has interchangeable magwells. This will be a package that breaks new ground in modular options for the AR15 weapons platform. Again, we have gone where nobody else has gone before, and got there first, with the best. If you want "cutting edge" items that are actually purchasable on the commercial market, and not just "future pie in the sky", MGI is the place to watch.

Since you are the closest thing we have got to an inside man on this, can you pass on my request for a full length 6 o'clock rail as standard equipment if there ever comes a version 2.0 of the CQB upper. The current shorty rail is too far forward to mount a vfg IMHO, and the levers are right where I would put my hand if grasping in the conventional manner.
Link Posted: 11/2/2005 4:55:59 PM EST
[Last Edit: 11/2/2005 5:02:02 PM EST by twl]
Link Posted: 11/7/2005 3:24:22 PM EST

I've got one of the "friction fit" hand guard extensions. Does MGI have anything yet beyond the friction fit? Thanks.
Link Posted: 11/7/2005 4:43:57 PM EST
[Last Edit: 11/7/2005 4:44:38 PM EST by twl]
Link Posted: 11/8/2005 3:57:00 AM EST
I have handled and fired one that was owned by another board member. I was skeptical at first, but very impressed once I handled it. The only downside I can see is that if you hold the front handguard close to the magwell your hand is right on the cam lock levers, but other than I couldn't really find anything I didn't like about it (except for maybe the appearance of the handguard itself, but that is an individual aesthetic thing...)

Link Posted: 11/8/2005 5:12:13 AM EST
I love mine

Link Posted: 11/8/2005 5:54:35 AM EST
Link Posted: 11/8/2005 7:06:32 AM EST
How do these cool ass handguards attach to the upper receiver? I assume they don't attach like a regular FF handguard as there is no barrel extension flange to clamp between the upper receiver threads and barrel nut.
Link Posted: 11/8/2005 7:22:34 AM EST
[Last Edit: 1/11/2006 9:07:13 AM EST by twl]
Link Posted: 11/8/2005 8:00:44 AM EST
Thanks for the info and pics. Very cool!
Link Posted: 11/8/2005 8:38:38 AM EST
TWL, that modular lower is awesome. Thanks for sharing the pic's.
Link Posted: 11/9/2005 11:46:22 AM EST
WOW that is cool, how much will one of these lowers be running?
Link Posted: 11/9/2005 1:53:23 PM EST
[Last Edit: 1/10/2006 5:18:02 PM EST by twl]
Link Posted: 11/9/2005 3:12:47 PM EST
Wow. I am truly impressed.
Link Posted: 11/9/2005 10:02:45 PM EST

Originally Posted By twl:
We're estimating $469 for the lower with both magwells, not including lower parts kit.

Tom, you forgot $200 for the SBR stamp
Link Posted: 11/10/2005 4:13:08 AM EST
Link Posted: 11/10/2005 4:32:48 AM EST

Originally Posted By ARKAR:
Anyone have any info/experience on the MGI quick-change upper receivers? Were these a success or a failure? Good or Bad? ARKAR

Edited to add a link:MGI Uppers

The only "problem" I have ever seen with one was not the fault of the upper, but still worth mentioning. The way the barrel locks in with the locking "gates" depends on a quality barrel extension - In one case that I know of, the user had a barrel extension that had a much thicker "lip" than it should have and the barrel would not lock into the gun... again, this is the fault of a cheap, out of spec barrel, but something a potential owner should know about.

The modular receiver is pretty neat -- a couple of years ago, when the quest for the "golf bag gun" (not like the Wild Geese) was in full swing, there were a few people working with ideas like this... I had a chance to play with one in Arizona that used a modular magwell and it was interesting, but at that point I saw no reason to want to take on home with me...
Link Posted: 11/10/2005 7:46:40 AM EST
Link Posted: 11/10/2005 3:03:36 PM EST
How about a VFG that twists to lock the barrell in the location the levers are? 2 birds one stone.
Link Posted: 11/10/2005 3:40:53 PM EST
Link Posted: 11/10/2005 4:20:01 PM EST
I had to whittle a bit of material off of my Kuehl 22lr barrel to get it to work. No big deal, just a little elbow grease. I have three other barrels that just dropped right in.

Link Posted: 11/10/2005 7:34:15 PM EST
We use the QCB upper for our test firing upper for any new rounds/barrels we develop and as such this system has been abused by us in various ways. Two other barrel makers use this system for this exact same reason - it simply cannot be beat. I have personally used it with .45 ACP, .338 Spectre, 7.62 x 25 Tokarev, .30 HRT, 7mm sCAR, .458 SOCOM, 6.8 SPC, 6 x 45, 10mm IAI. We are contemplating at least two offerings that FULLY leverage the advantages of the combination of the MGI upper WITH the modular lower. Tom knows what I mean for one of these ...

Will share pics once the concepts are further along
Link Posted: 11/13/2005 4:44:33 AM EST
[Last Edit: 11/13/2005 4:46:33 AM EST by twl]
Link Posted: 11/13/2005 11:05:16 AM EST
I was in management for over thirty years, and have never seen this level of frank communication by people in the upper levels of a corp. Kudos to MGI et al !!! This is how business' should be run!
Link Posted: 11/18/2005 11:39:57 AM EST
I've always thought the MGI upper was a neat concept, but still needed modifications in the areas of finish and location of rails and levers. However, the new lower that allows drop free AK mag use, and the fact that the MGI uppers are relief cut for this blows me away. I'm going to be keeping my eyes open for this. Fucking incredible.
Link Posted: 11/18/2005 1:10:32 PM EST
[Last Edit: 11/18/2005 1:26:10 PM EST by twl]
Link Posted: 11/18/2005 1:17:24 PM EST

Originally Posted By twl:

Here's another nice photo showing the AR magwell detached, for detail of both halves.


Yes, yes. I'll be coming along shortly with the finished photos of the AK magwells too.

So, uh, which half is the receiver/serialized part?

Link Posted: 11/18/2005 1:31:49 PM EST
[Last Edit: 11/18/2005 1:42:12 PM EST by twl]
Link Posted: 11/18/2005 2:02:25 PM EST

Originally Posted By twl:

Presently, we are contemplating naming the system, "M.A.C.K.-16" for Modular AR Conversion Kit -16. Whaddya think?

Here's an idea that you may have passed up, making a magwell that will for .308 mags and an ar10 upper.....yea..

Use My idea and I want an MGI upper in exchange..

As far as a name, have a contest...mack just seems to lame. Kit isn't a term you want to use in a cool sounding acronym.

Modular Caliber Assembly Receiver
Universal Magazine Receiver

Oh well. I am not feeling creative today.
Link Posted: 11/18/2005 2:11:46 PM EST
[Last Edit: 1/10/2006 5:21:18 PM EST by twl]
Link Posted: 11/18/2005 6:13:22 PM EST

How about NMRP for a name. Non-monolithic Receiver Platform. Sorry, couldn't resist.

One sick and twisted non-MRP happy MGI customer,

Link Posted: 11/23/2005 7:08:18 AM EST

Originally Posted By twl:
In addition to AK47/AK74, and AR15, we'll also have magwells for 45ACP(Grease Gun mag), 9mm(mag TBD), rimfire calibers, and others as we go along.

Make a magwell that uses unmodified Uzi magazines, and you'll have sold me on it.
Link Posted: 11/23/2005 6:03:44 PM EST
TWL any ideas when a new handguard system willl be ready yet??? the full length protector that i have on mine is constantly rattling around and "almost" slipping off if it wasnt for the gas block. it just seems that on a finely tuned device like this the handguard extension shouldnt be half assed

Thanks Adam
Link Posted: 11/24/2005 3:14:44 AM EST
[Last Edit: 1/11/2006 9:10:53 AM EST by twl]
Link Posted: 11/24/2005 9:54:44 AM EST
awesome thanks i really appreciate it. I was also wondering would it be possible to send my current lower to you and have it made into the modular lower. i really like the Rock river and was just wondering thanks Adam
Link Posted: 11/24/2005 10:40:06 AM EST
Happy Turkey-Day!

Ready to take her out and shoot this weekend! Waiting on a 458 SOCOM barrel from Marty, and then the fun will really start.

Thanks, Tom. You and Mack are great guys to work with. Great product, great service, great company.

Link Posted: 11/24/2005 11:29:23 AM EST
My 357 SIG barrel from AR-fan kicks ass

Link Posted: 1/11/2006 9:12:30 AM EST
Link Posted: 1/11/2006 11:08:25 AM EST
[Last Edit: 1/11/2006 11:11:47 AM EST by Green0]
Bangor MAINE!

I've been there.

Everybody flies through there with the Army. I never knew I was soo close.

That would make one bad ass SBR lower.

Finally there will be a use for that folding trigger guard.
Link Posted: 1/11/2006 8:51:20 PM EST
Link Posted: 1/12/2006 7:22:45 AM EST
Link Posted: 1/12/2006 8:20:49 AM EST
Unless those barrels are cheap and out of spec that doesn't sound good.

I'm a huge fan of very tight barrel nut tension as it seems to have a correlation with zero retention.
Link Posted: 1/12/2006 9:12:46 AM EST
Link Posted: 1/12/2006 11:38:22 AM EST
Right, but other people deffinitely do use sights.

I would hope most of the worst extensions are DPMS. If they are sloppy within the other two companies it would certainly be tough to work a sure-fire approach to get a good fit.
Link Posted: 1/12/2006 11:49:33 AM EST

For the sake of those of us in PRK, can you just run a few hundred (or thousand) with the STAG rollmarks?

Link Posted: 1/12/2006 5:13:51 PM EST

While I do not have the specs for MGI, my QCB has been great with a few barrels that run .131ish of an inch on the thickness of the extension flange. This is with a Shaw barrel, a Marty special, a factory Colt and a factory Bushmaster. My Kuehl 22lr barrel had to be whittled down to this .131 dimension as it was 3 or 4 thou over. With this dimension, my levers become snug right at the detent, and it takes a bit of effort to get the levers behind the detent. Its been working great.


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