Not official military issue but I buy M1907 slings, 1911 holsters, etc. from these
folks.
So far, no issues with any of them. I just bought 3 of the M1907 slings about a month ago to put on a couple 03A3's and M1 Garands.
I don't compete, I just wanted a nice sling on my old rifles.
I will say that the holsters for 1911's will fit a GI 1911, but not one with tall sights, ambidextrous safeties, etc. GI 1911, not a customized 1911. I got one for my brother a couple years ago and his SA 1911 would not quite allow the flap to latch. He might have been able to stretch it, but elected to just say it wouldn't fit and gave up on it.
I have no affiliation with these guys, I've just bought some stuff from them over the last 3 or 4 years.