Quoted: Thanks for the info guys. That is what I love about this forum.
Bearbait1 I will probably email some more questions to you later. Thanks.
twl is there a certain bolt carrier that you guys recommend to use with this system? I was told in and earlier post that I just needed to change the bolt as I change each barrel and keep them together as a set. Also with the barrel when I order it I just need to get the barrel, gas block and gas tube correct? I do not need the barrel nut because of the camming system used to tighten the barrel, correct?
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Any AR15 or M16 bolt carrier will work fine with the MGI QCB upper receiver system.
The only time any modded bolt carrier is needed, is if you pair your QCB up with our new MGI Modular Lower receiver, and use the AK magazine well with AK mags. Then a modded bolt carrier is needed, and we can supply that.
As far as matching bolts with barrels, the bolts are interchangeable in same-caliber barrels, and can be used interchangeably, as long as everything is "in-spec". I would avoid using worn bolts and worn barrel extensions in combination, as that could lead to problems. However, relatively new parts should have no problems. If in doubt, use a headspace gauge. Having a specific bolt to match to each barrel is a good idea, but it is not required, as long as you make sure that your parts remain "in-spec", and headspace is proper.
For use in the MGI QCB, only the barrel(with installed barrel extension), and the gas block and gas tube are needed. No barrel nut, delta ring, or handguard keeper are used in the QCB system. Many times, these parts just come with the barrel when you order it, and you can just take them off before installing it in a QCB.
I'd recommend getting barrels that have M4-ramps on the barrel extensions, because our new QCB units all have true M4-ramps in them now, and the M4 extensions will be properly cut to mate up with the M4 feedramps in our QCB receivers.