You were contending that Olympic Arms was the only maker of AR-15 rifles. I pointed out that there are close to 30 makers of the AR-15 variants and clones in the US alone. If they can't get their weapons and parts from Olympic, they can go to plenty of other vendors. If a cop can't get a part for his current weapon, I'm sure the department would issue him another one. No biggie.
They are the only maker of the AR-15. As you pointed out, other manufacturers, like Bushmaster, make copies or knockoffs of them. If you don't understand the difference between a copy and an original why am I even talking to you?
By the way, Olympic Arms is known for its conversion kits to mate parts from different manufacturers so they work together. I didn't know that until a gun friend told me.
All those kits just dried up for New York also.