Big 5 - 870E "Security" comes with lock??

[Prc329]

I though 870 only came with the integrated trigger lock. I bought my 870 express from Turners and it did not come with a lock and I did not have to buy one because of the integrated lock. The funny thing is my 686 has an integrated lock as well but still came with a lock. Go figure. I know its a long gun vs a handgun but I find that curious.