The TRYBE Defense AR-15 Fully Assembled Upper Receiver Type II w/ Dust Cover & Forward Assist is a Mil-Spec AR15 receiver and cannot be used for a 6mm Creedmoor.
The TRYBE Defense AR-15 Fully Assembled Upper Receiver would require modification to the port door in order to properly eject calibers such as 50 Beowulf, 458 SOCOM, 450 Bushmaster etc.
The TRYBE Defense AR-15 Fully Assembled Upper Receiver Type II w/ Dust Cover & Forward Assist does not need to be sent to an FFL unless your local laws specify otherwise.
The TRYBE Defense AR-15 Fully Assembled Upper Receiver Type II w/ Dust Cover & Forward Assist may be able to replace the polymer upper on the Chiappa M4-22. However, I recommend contacting the manufacturer to confirm the compatibility of the upper receiver components with a Mil-Spec upper. If there are proprietary components that require the use of that polymer upper then it will not work.
The TRYBE Defense AR-15 Fully Assembled Upper Receiver Type II w/ Dust Cover & Forward Assist will work with Mil-Spec lower receivers. This would replace your Olympic Arms AR15 with a fixed carry handle.
I actually discovered that it is what it is. High and low profile only applies to Ar-10 and Lr-308 rifles
The TRYBE Defense AR-15 Fully Assembled Upper Receiver has more of a matte finish.
Yes, this barrel will work in the Trybe AR-15 upper.
Yes, this is a standard AR-15 upper receiver and will work with a S&W M&P Sport II.
This is an upper receiver and does not have a gas tube specification. The gas tube specification is completely dependent on the barrel you are using. You need to verify what gas tube length and gas block diameter your barrel requires.