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The gas length is referencing the handguard length needed to mount behind an A2 front sight. Pistol length gas will work just fine.
Yes, a 10.5" barrel should work with the 8.5" handguard.
Please email us at techsales@opticsplanet.com so we can further answer your question.
Yes approximately, however It is recommended you have at least 2 inches of barrel in front of the handguard.
Yes, it should fit and function just fine.
Please email us at techsales@opticsplanet.com so we can further answer your question.
To better understand the installation process, I would direct you to the videos on the resources page here:
https://www.pantheonarms.com/product-page/prometheus-mx
Mark H.