Here is a second recent acquisition I made. This is the latest slotted butt stock groove I have ever personally seen. They mixed the main spring housings in as I have a D serial number without the slotted butt stock groove and I have seen some C's without them. I also have another 1/E in the 8k series without the slotted main spring housing as well. This one came as a complete rig with spare mag and holster. It is 100% matching with an excellent bore and some wear on the finish from years of sitting in a holster.