What airsoft gun is the best within a 50 below price range and 300+ fps?

A broken one at the very best. The cheapest airsoft rifles that aren't complete trash cost atleast $120 This is going to be the best starter rifle for you: http://www.airsoftgi.com/product_info.php?products_id=3309

I think I found a few things that would meet your needs. I'd stick with a good spring pistol as they'll give you a feel for the power, range, and feeling (Ouch!) of getting hit with an Airsoft BB: http://www.airsplat.com/Items/AP-HA-112BL.htm http://www.airsplat.com/Items/AP-HA-117LB.htm http://www.airsplat.com/Items/AP-UMX-HK-P99C.htm http://www.airsplat.com/Items/AP-HA-119B.htm Airsplat has the best selection of the latest products out there at really competitive prices. I shop there and they're really good with getting things to me consistently on time.

if you want your first gun to be good, dont listen to the guy with the air gun warehouse link. here's a link to a really good begginer gun that 80 dollars with shipping. very high quality gun, and read the testimonials on the page. http://www.pyramydair.com/p/hk-MP5-navy-dual-power-airsoft-rifle.shtml

here is a link http://www.airgunwarehouseinc.com/spaigu.html