Ok, so this is going to be a dumb question, but I have a bunch of spare AR15 parts and I want to get creative with an upper build. So, how does this top rail mount? Is it something I could mount onto a standard rail and upper with picatinney rails? From the few pictures I see, it looks like it, but I want to confirm before buying. And if anyone has an idea of how long this is as I have been unable to find any specs on it that would be great.

G36c Top Rail

The upper build I am going with (most of the parts in hand)
Gibbz arms g4 side charging upper (need it)
11 inch or 7.5 inch barrel (have both)
gibbz handguard  (length depends on G36c top rail over all length)
G36C top rail
Sbr lower in pistol config while form 1 waits (have it)

once form 1 approved:
ACE skeleton stock
LAW tactical folding stock adapter (if I can ever find one...)

Thanks for your help!