Here are a pair of 1952 Belgian ABL rifles. The 22lr trainer and the 30-06 parent rifle. The trainer is not a converted centerfire rifle. It was made at FN in 1952 as a 22lr single shot. FN also made one for Israel at the same time. You will notice the knoch that was made on the 30-06, to handle it's long length. They used the trainer into the era they went to the FN FAL,. That is why it also has the peep sight.