i have been wanting an ar-15 for a while, but coming up with that much dough all at once is difficult for me. so i was looking at stripped lowers this morning. there seems to be a HUGE price difference in some of them. the norm, sems to be around $125.00 (+shipping). the most expensive i have found so far is $149.00, and the lowest was $59.00. the $59.00 ones are being sold as "surplus", whatever that means. they are made by AERO PERCISION. since i dont know anything about this, i figured i had better ask a few questions. the LAST thing i want to do is have an entire gun built, and find out the reciever is scrap. and i have to start all over again. i THINK these are supposed to all be made the same. but supposed to and actually are can be worlds apart. is there one lower better than the rest? is it that much better? is there something special i should be looking for in a lower?