Yes, the romeo 5 will fit and work.
This riser is made to accept any standard "micro" red dot and clones like the T2 or holosun 403 series.
It will not, the mount is made for the aimpoint micro series.
This riser is made to accept any standard "micro" red dot and clones like the T2 or holosun 403 series.
Yes, it will, but please be aware that mounting the Sparc AR on this is going to place your red dot at well over 3" above whatever you are mounting too. It's not a recommended set up.
Yes, the Holosun HS503 is compatible with the Unity Tactical FAST Micro Mount.
Yes, the Unity Tactical FAST Micro Mount is compatible with the Sig Sauer Romeo 4 line of optics (4XT, 4S, 4H, 4T, and 4T-Pro).
The Unity Tactical FAST Micro Mount will be compatible with the Romeo MSR, as the Romeo MSR shares the Aimpoint T1/Micro footprint.
Yes, the Unity Tactical FAST Micro Mount is compatible with the Holosun 515 series of optics as well as any other optic that shares the Aimpoint T1/H1 footprint.
No. The Unity Tactical FAST Micro Mount will provide a 2.26" centerline height with both the Romeo 4T and Aimpoint T2.