I am finding out that these are getting rarer as time goes on. The M416 primarily. I searched and searched for a good M416 that was not molested (i.e. cut for tailgate, etc). I also found that trailers that were drilled for this, cut for that, tail-gates cut out, etc.. were fairly cheap (200-700) but the unmolested trailers are 1000-1500. Good Luck!