Mike, I have a lot of books on the SAS. I don't remember that they carry BHP with an empty chamber. Having said that, there is a nagging thought that it's possible. I also spent some time with the old director of training at H&K, he was ex SAS. In fact he was on the team that went in the Iran Embassy in London. We did a couple of police demo's together, when I was a law enforcement dealer and class 3 dealer for H&K. He told me a story about his time in northern Ireland. He was trying to get in with an IRA unit and they took him on a ride to another pub, however ,as the car left town......he got in a gun fight in the car. Two guys in the front seat and he was in the middle of the back seat. Sounds like he was fully loaded to me. You can search british military units.uk and get to the British Army web site. Then click on ceremonial, which will bring you to the Household Brigade click on that and then go to Irish Guard. This the Irish Guard official web site.The only thing there about the SAS is the reserve, which has nothing. Regards, Tom