RevSims16 from United States, OR Public Profile

I bought this part after reading both the specifications that optics Planet says "will fit most m4, m16 and ar15 mil spec lowers". I also read the question people asked "will this fit an ar15?" and someone replied saying it will fit mil spec lowers. After receiving it I open the box to notice it has a retaining pin like the ones that hold the upper and lower together. At first I thought ok maybe the trigger guard goes under it for some sort of support....NO NOT AT ALL. Turns out if you look up any of the 3 part numbers on lancer's web page they clearly stated that this is only used with the Lancer L15 lowers. To be 100% and make sure it wasn't a typo I called lancer explaining my issue and gave the gentleman the part number. Which he confirmed it is in fact only for the Lancer L15 lowers. Optics Planet please fix this problem. Thank you

I had to spend multiple hours on filing and sanding the edges to get the locking pin to line up. After I got it perfect it turned out good, found an easier way to do it for my grandfather and friends.