M16x1 LH thread protector?

[Spaenaur]

Hi,
I just bought a glock 21 sf with a original glock threaded barrel.
I have hard time to find a metric threaded protector for it.
Someone know a place in Canada who sell this part?
Brownells are out of stock right now.

The threaded size is m16x1 Left hand.

 

[Greenhorse six]

I picked one up for my G19 at CSC in Calgary, they might have one for the .45 .