Right now I have a Rifle with the Bushmaster piston conversion kit. Everything works great I've had it for years, would recommend it to anyone.

My question is... Im wanting to buy a quad rail that will fit it. Currently the handguards that came with the kit are installed. I have standard A2 sight block

I used to run a VLTOR CASV- EL and then a CASVM (after cutting the front post down). Both needed Dremmel work on the inside to clear. Easy to do. I currently switched to an LWRC rail that has the top removable to access the piston. I have an ARES piston with the Bushmaster clamp on it so it is identical the Bushmasters conversion kit. The LWRC rail also took dremmel work to clear the clamp. The LWRC rail got a little thin in piston clamp area but with ladder covers it is not noticeable. If I get a chance and Remember,  I'll throw up a few pics.

Please do! Ill be honest, the only reason Im even considering putting a quad rail on is for looks. The only thing i use is a vertical foregrip, and i have a rail installed at the bottom of my handguards now lol.

So basically looks are everything!

Also does anyone know if the Daniel  Defense Piston Omega Rail 7.0 Large diameter work with the A2 front sight? On their website it states the the large diameter version will work with bushmaster piston systems.

Probably a stupid question, Im still AR Stupid

Here's pics:

First rifle is Adams Arms with my first CASV-EL.

Second is the ARES.

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Sorry for the lousy lighting. I don't have Stickman on my speeddial

What type gas block are you using?

Standard A frame fsb that met my dremmel tool . Its holding me over until  I get an SLR adj block

Looks worse in the pic because of the flash. In person doesn't look half bad, and its even better under the rail.

I use a MI two piece rail on my rifle.  I've had some slight rubbing.  I dont use the clamp because I have a heavy barrel.