I ordered the elanders from mako back in December and finally got them today. I didn't have any problems with them in my bushmaster lower. Before I got them I was pretty worried by reports that the manufacturing tolerances weren't right and people couldn't get them to seat properly. I didn't have any problems with pushing them in with a closed/open bolt, 30 rnds or empty. If anyone else out there is waiting on an order, hopefully you won't be disappointed.