Best rail for ar uppers with front sight block. - Troy Battle Rail Delta-CX - 12in, Black

I have a couple of these on AR carbine uppers that have the traditional front sight. They work wonderfully. Has a full picatinny top rail a short section on the bottom for bipod or foregrip. You can buy and add as many side section of rail as you want. The first time I installed one it was a little tricky but once I figured it out they are extremely easy to install. It changes a carbine with standard handgaurds into a totally different and much more flexible gun. Seems pricey but to me it is well worth the cost.