Bought my M&P Sport last summer and am now in the process of upgrading. I would like to get a rail system that will allow me to equip a bipod to the front so i can shoot at 100+yds. There are so many out there that im a bit overwhelmed at this point...So here is what I need from you folks.

This needs to be done on a fairly tight budget. I do not need anything made of some space metal only found on certain parts of the planet and costs a million bucks....lol. All i need is the most basic quad rail so i can put a cheap Harris bipod or whatever on my AR. What do some of you in my position use on these M&P Sports that seem to work just fine and doesnt cost a whole lot?

Provide me a link if you make a suggestion on where i can purchase...

THANKS!!