No, this is not compatible with the Enhanced uppers that have the built in barrel nut.
Yes, the Spikes Tactical LW BAR2 Quad Rail is compatible with any Milspec Ar15 upper receiver and includes all components necessary to install.
The Spikes Tactical LW BAR2 Quad Rail comes with (10) Grade 8 T-20 Torx Screws (2 spares). For more information regarding spare screws I recommend contacting Spikes Tactical.
The Spikes Tactical LW BAR2 Quad Rail will not work with the Aero Precision M4E1 Enhanced upper receivers. Those upper receivers are only compatible with the Aero Precision Enhanced Handguards.
Yes, you can use a standard GI 3-pin wrench
Yes, this should work well.
The I.D is 1.8in if your kit is below that diameter it should work well.
This rail has an I.D of 1.8 inches, if you suppressor diameter is below that it should work well.
Providing your BCM upper has a low profile gas block this should work well.
Please email us at techsales@opticsplanet.com so we can further answer your question.