There are pictures on here somewhere. The difference is that a true AE barrel (UK AE barrels only) don't have a fully threaded tennon, the tennon under the recoil out is unthreaded. The tennons for AW/AX/AT are fully threaded because they screw all the way into the receiver. All of the AINA barrels whether they came on a AE or not are fully threaded on all models or as replacement barrels. Because of the tennon you can use AW barrels on AE's but you cannot use the true AE barrels on AW's.