I picked up a factory replacement barrel and slide. Both components have the single letter prefix; the barrel having the L prefix and the slide having the S prefix. Both the barrel and slide have Austrian proofs and the three letter test firing date code. Both the side and barrel have 2003 date codes. I've seen the three letter date codes on my Gen 1 barrels, but I've never seen the date codes on a slide. If anyone has a replacement barrel with the L prefix, or a slide with the S prefix, can you confirm the presence of the Austrian proofs and the three letter date codes?