Second Gunz's recommendation on one of the Centurion rails. If you insist on removing the FSB, send it to Robb Jensen on here for a top notch shave job. https://www.m4carbine.net/member.php?u=394
I'd leave it. Gunz is right of course, you can't get much simpler with a quad rail than Centurion. Handguard cap/delta ring are all you need to remove.
If you feel like spending some quality time with your grinder, you can cut your FSB/grind it down into a low profile gas block. I did that to make room for a 10" C4 rail.
Completely happy with it. Cheap and robust solution.
You might also consider the Troy Battlerail Delta or the Troy Battlerail Charlie. These are drop-in free float rails that require no modifications. I have no experience with these particular rails, but all the Troy gear I've used is good stuff.
It's honestly not hard at all. I just did an install of a Daniel Defense RIS II FSP rail this past week (Much like the Centurion FSP rail, but a requires a little extra work).
I've been shooting an AR for the past 4 years or so and just now decided I wanted a longer rail( I have longer arms so the extra reach is nice). I say take your time and learn what it is you dislike about the current setup and go from there.
The Centurion C4 is probably your best bet if you just have to have a rail, since it uses the stock barrel nut. You will have to dremel off the delta ring and spring however.
Definitely make sure you have the right tools before you even THINK about doing anything though. Going off of some of the more experienced members advice, I used a Geissele reaction rod, proper punch set, and Brownelles front sight block and it was easy as can be. The tools aren't exactly cheap in comparison to what you pay for the rail, but the peace of mind that it was put together properly is worth the money.
Appreciate the responses everyone. I have learned quite a bit in this thread alone. I think I am going to wait to install a rail until I can actually get out and shoot. I know in the future I will want one but as of now, I'm not sure whether to add a FSP rail or grind down the FBS and add a regular rail with BUIS. Hopefully I can make up my mind!
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