I purchased my Ruger American Gen 2 on the 20th of last month. Since then, I've sent it in twice. The second time it resulted in a replacement. The replacement, however, is having the same problems. The bolt locks in the upward position just before closing and requires EXCESSIVE force to close it. The cycling speed does not matter. I've tried multiple types of ammunition. I can cycle the bolt easily with no ammunition in the mag. I don't know what is going on with the rifle. I've lubed the bolt and cycled it about 100-150 times. Nothing is working.