A reasonable question but might I suggest you look at true Colt M16 if your price range is as described...not converted, drop in auto sear, linkage, etc. guns described as M16's but only govt. M16's....their prices are going up rapidly...so shot the snot out of it and make some money...you can always look at
www.gunbroker.com to get an idea of what asking prices are actually selling for...do a google search and you will also come across GunsAmerica Gun Classifieds as well...M16 will be found in the 14-15000 dollar range and I know of at least one person who has 30 of the waiting for them to hit 30000.00 before he will sell any of them...Some might think he is goofy but I remember when these were 2-3000.00 and I thought they were overpriced thennnnnnn.....dummy me
hope that helps