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 What AR15 Calibers can you change to by changing only the barrel, bolt and maybe the magazine?
_DR  [Member]
6/10/2004 6:16:19 PM EST


I can think of 7.62x39, 300 fireball and 6.8mm SPC. AM I missing any?
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sterling18  [Team Member]
6/10/2004 6:59:46 PM EST
Can the same be applied to 9MM and 45 ACP???
Boomer  [Team Member]
6/10/2004 11:02:19 PM EST
.22LR
texasak47  [Member]
6/11/2004 2:19:12 AM EST
.50 beowulf
StewartTR  [Member]
6/11/2004 3:09:48 AM EST

Originally Posted By sterling18:
Can the same be applied to 9MM and 45 ACP???



I don't know about 45 ACP but 9mm requires changing the hammer, buffer and a magazines well adapter.
NESurvival  [Member]
6/11/2004 8:33:41 AM EST

Originally Posted By _DR:

I can think of 7.62x39, 300 fireball and 6.8mm SPC. AM I missing any?



6.5 PPC, .50 Beowulf, 458 SOCOM
_DR  [Member]
6/11/2004 9:13:13 AM EST
OK, so to summarize, here are all the calibers other than CAL .223/5.56mm you can have by changing only the barrel, bolt and magazine:

1. CAL .22LR
2. 6.5mm PPC
3. CAL .50 Beowulf
4. CAL .458 SOCOM
5. 7.62X39mm
6. CAL .300 Fireball/WHISPER
7. 6.8mm SPC
(if it ever goes into commmercial production)



And all that with only a barrel wrench, vise, action block and a set of punches.
Now that is excellent!
sosabowski  [Member]
6/11/2004 9:25:13 AM EST
6mm PPC. Bolt, barrel and slightly modified 7.62x39mm mag.
DocGP  [Member]
6/11/2004 9:31:46 AM EST
Use dedicated uppers and all you need is your fingers!!

Doc
twl  [Member]
6/11/2004 9:36:42 AM EST
All of the above (listed by Dr) calibers can be used in an AR15 with the appropriate barrel/bolt/magazine changes.

However, the part about "action block, wrench, and set of punches" is not the whole story, ANYMORE.

With the MGI QCB(Quick Change Barrel) system, you no longer need any tools to make these caliber changes.
You can now change the barrel in less than 1 minute, and then open up the receiver and change the bolt, then use the correct magazine, and you are "good to go".
When you want to change back to the original caliber, just do the same process.
It is accomplished in minutes.
No more buying redundant upper receivers, handguards/Freefloat tubes, which can add alot of unnecessary expense, to make quick caliber changes. And/or no more aggravating, time-consuming dissassembly/reassembly of your uppers.
One MGI QCB upper, and a set of barrels/bolt/magazines for your favorite calibers is now all you need.

Please email me with any questions about this system.
_DR  [Member]
6/11/2004 5:37:36 PM EST

Originally Posted By twl:
All of the above (listed by Dr) calibers can be used in an AR15 with the appropriate barrel/bolt/magazine changes.

However, the part about "action block, wrench, and set of punches" is not the whole story, ANYMORE.

With the MGI QCB(Quick Change Barrel) system, you no longer need any tools to make these caliber changes.
You can now change the barrel in less than 1 minute, and then open up the receiver and change the bolt, then use the correct magazine, and you are "good to go".
When you want to change back to the original caliber, just do the same process.
It is accomplished in minutes.
No more buying redundant upper receivers, handguards/Freefloat tubes, which can add alot of unnecessary expense, to make quick caliber changes. And/or no more aggravating, time-consuming dissassembly/reassembly of your uppers.
One MGI QCB upper, and a set of barrels/bolt/magazines for your favorite calibers is now all you need.

Please email me with any questions about this system.



One question - how much?
twl  [Member]
6/12/2004 10:24:40 AM EST
The MGI QCB upper is only $550.
You only need one, and you can use all of the above available calibers, with appropriate barrels, bolts, and mags.
It includes a mil-spec flat-top upper receiver, the QCB locking block/cam system, and a ventilated free-float tube. It is already assembled as shipped.
No barrels are included.
Especially for someone who wants to use a variety of calibers, very good savings(and versatility) can be had with this system.

The barrel nut, delta ring and handguard ring must be removed from the barrels you plan to use with this system, as they are no longer needed.
No other mods are necessary, and any normal AR barrels, bolts, carriers, gastubes etc, can be used.

Please email me if I may answer any more questions for you, or take orders.
twlyons@juno.com
MGI National Sales Manager
_DR  [Member]
6/12/2004 11:20:01 AM EST



Originally Posted By twl:
The MGI QCB upper is only $550.
You only need one, and you can use all of the above available calibers, with appropriate barrels, bolts, and mags.
It includes a mil-spec flat-top upper receiver, the QCB locking block/cam system, and a ventilated free-float tube. It is already assembled as shipped.
No barrels are included.
Especially for someone who wants to use a variety of calibers, very good savings(and versatility) can be had with this system.

The barrel nut, delta ring and handguard ring must be removed from the barrels you plan to use with this system, as they are no longer needed.
No other mods are necessary, and any normal AR barrels, bolts, carriers, gastubes etc, can be used.

Please email me if I may answer any more questions for you, or take orders.
twlyons@juno.com
MGI National Sales Manager



Are there any reviews out there?
What kind of testing has been done?

twl  [Member]
6/12/2004 12:18:38 PM EST
The MGI QCB upper unit has been over 2 years in development and testing. Our testing is beyond what would be encountered under normal use, and we design to pass military testing under the worst conditions, and/or at Crane.

It is currently under review by Small Arms Review magazine, and 2 other tests by gunwriters.
These will unfortunately not be in print until the fall, because of the 2-3 month advance time frames of the magazines.

There have been numerous "pre-production testers" during the last 6 months, including retired Special Forces personnel and weapons instructors.

After surviving the "torture tests" and having a few small changes made, mostly to make it easier to use in the field, the unit has been deemed ready to introduce to the market.
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