Hello, I am new to the Class III guns, but I've noticed it's actually quite a good investment. I had an opportunity to buy a full auto sear from my friend back in 2007, passed the chance since I didn't see the justification for spending so much $. But been noticing the value has been steadily increasing, so I am in the market to get a full auto sear for MP5; is there a good website that accurately shows the value in todays market?