Nice, didn't know that-I believe the 5,000 ordered way back in 2005 by U.S. Army TACOM were for DOD police in Iraq. Then there's the 5,000 ordered recently with the other Sig long guns that was probably for some kind of foreign assistance...would be cool if anyone knows about that.
I've heard that. P229 baseplates also work; there is a small gap between the frontstrap but that may actually help avoiding pinch during a reload, like the Springer baseplates I linked above.