The 507k is not the same as the Romeo Zero, regardless as to whether Holosun makes the Romeo Zero. The 507k is metal, the Zero is plastic. The design is significantly different. I have a couple thousand rounds on a 507k. Thing is great. Only improvement would be a bigger integrated iron rear sight with tritium inserts.

The 507k is not the same as the Romeo Zero, regardless as to whether Holosun makes the Romeo Zero. The 507k is metal, the Zero is plastic. The design is significantly different.

I have a couple thousand rounds on a 507k. Thing is great. Only improvement would be a bugger integrated iron rear sight with tritium inserts.