[Drake]

Originally Posted by daveyster

But what I do want to know is, how can I put a rail system on.

Can I just buy one of those drop in systems and attach it?
- For a drop in system, don't I need that thing with the teeth so it stays in place?

It depends on the rail: some systems (like the Madbull DD rails) come with their own special barrel nut; others, like King Arms RAS, sometimes come with a barrel nut while other rails rely on the user having the correct delta ring/barrel nut on their gun. A delta ring or barrel nut are cheap and easily replaced as long as the threads on your gun (what brand is it? someone said ICS?) are compatible.

I see there's a ring with fake barrel nut "teeth" on it so that may be usable for certains rails (like a normal KAC RIS handguard etc).

Can I buy a free float system and attach it?
- Will I just need to cut the whole delta ring off?
- Will I need to take my front sight off?

You can remove the front sight and take the rings off. Don't cut them off. You'll have to remove the sight to put on the new barrel nut anyway.

There should be two pins in the front sight, below the barrel: just tap those out with a punch. Make sure you push them out in the right direction if they're directional (if they're roll pins one side might be tapered, that side goes out last; or a solid pin might have ridges on one end, that end goes out first).

Check for screws and stuff too, under the front sight (usually under where the sling swivel is mounted)

Also, if I need to take off my front sight, how do I do that?

see above.

I have looked in videos and I saw people taking some pins out of the two bottom holes, but mine didn't come with any in:

That link didn't work.