I would like to put a sling on my MP15 ORC and the only part I can find that looks like it will fit on the gas block is the Troy S.S. Q.D. Swivel Sling Mount. Part number SMOU-SSQ-00BT-00 . Has anyone ordered this sling swivel and is this the correct part for my MP15?

Yes it is the correct one for your mp15. I got mine from Aim and they offered another one (not stainless) for a little less money. The troy was cheaper as there was 1cent shipping.

Many Thanks T, I just put the order in thru Troy.

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G-Man