Where to buy uppers with low profile gas blocks?

[JSGlock34]

I was wondering if anyone knew of a dealer who sold uppers with a low profile gas block already installed? Or a front sight block shaved down to accommodate a one piece rail? Most of the separate uppers I've seen for sale have the standard post, but perhaps I'm looking in the wrong spot. I am not looking for an upper with a rail already installed - that work I'd prefer to do myself.

Thanks!

[Ron S.]

Grant from G&R Tactical, right here on M4C.

www.gandrtactical.com

He'll build you anything you want.

[CLHC]

Same with what Ron S. said above. There's also Rainier Arms.

Hope you find what you're looking for and Enjoy!