Still waiting - Pro Mag Mossberg 500/590 Enhanced Slide Safety

I ordered this item along with a new slide action for my 590. The order was placed on Feb 24, I'm still waiting for both to arrive! I contacted OP and was told the other item was on back order from the supplier even though it still shows as in stock today on March 26. They Guesstimate it being in stock around the 1st but can not guarantee my part as it is a first come first serve basis!!! So honestly at this point it is hard to review an item I still have not received but as this was the second time I was asked to provide feedback I figured I would vent my frustration on the poor customer service and misleading availability from Optics Planet...