Currently, the system is designed only for use with direct gas impingement system.
It will not work. Here is the handguard compatibility chart found on Pantheon Arms website: https://www.pantheonarms.com/support
All of our handguards measure 1.75" ID.
The Pantheon Arms Prometheus Take-Down Kit w/Handguard For AR-15 is compatible with most Mil-Spec AR15 upper receivers. So if your Spike's Tactical Upper is Mil-Spec and accepts Mil-Spec handguards the Pantheon Arms Prometheus Take-Down Kit w/Handguard For AR-15 should work.
Each version of the Pantheon Arms Prometheus Take-Down Kit w/Handguard comes with the Pantheon Arms Dolos standard lock collar, and Pantheon Arms Dolos tri-lug assembly.
Please email us at us at Techsales@opticsplanet.com to further assist you with your question.
Hand guard Length: 6.5 in
This is a first production product that may have been used in shows or by reps of companies. They should be in new or like new condition.
As long as your barrel utilizes a pistol or carbine length gas system, it will work. For assistance on compatible handguards, you can refer to the manufacturer's support page: https://www.pantheonarms.com/support
Depending on the measurements m-lok may be compatible but not guaranteed.