I traded a rifle for an Anderson AM 15 yesterday. The rifle is said to be new and unfired, which it appears to be. The lower has Andersons's stainless steel trigger and hammer. It has a utg milspec buffer tube and a utg stock. It has a seekins free float rail as well. I don't know if the rifle is a 100% anderson or if it was pieced together. The rifle looks great and I am happy with it. I do however have a problem with it. When I first looked at it the rear takedown pin was very hard to push out. I thought it was just tight from being new. (I have had that happen on other rifles.) So hard that I couldn't do it without using a punch. Once out the upper came off with no trouble and everything looks normal. When i put the upper back on the lower it matches up fine. But when I push the rear pin in I have to tap it to get it to go in all the way. Could it be that the holes are misaligned? Other than that there are no issues that I can see. The upper has a splintered A forge mark and the lower is a keyhole. The barrel is marked R 5.56 NATO 1x7. It is an m4 profile. The bcg is also jet black instead of being parkerized. It is also a full auto carrier. Any help would be appreciated. I forgot to mention that when I charge the rifle it moves freely as it should. Everything works properly except for the rear pin. Just wish I knew if it were all Anderson or not. Any ideas?