Ops Core Ballistic Helmet Comparison

I purchased this Ops Core ballistic helmets and I am showing how I set them up. I also show the differences in dimensions between the helmets. I will include where I purchased each one of these helmets. The rest of the accessories were bought from hcctac.com.

NOTE: the Ops Core XP is a HIGH CUT helmet and will need a specific kind helmet cover and the SF/XR helmets are the SUPER HIGH CUT. Please be aware of this when purchasing the proper fitting cover. Here is a link of an option for the Ops Core XP helmet cover:
https://agilitegear.com/collections/helmet-covers/products/ops-core-fast-st-xp-helmet-cover-gen4?variant=32716815564933

Ops Core XP:
https://tnvc.com/shop/ops-core-fast-xp-ballistic-high-cut-helmet/

Ops Core Fast SF Helmet:
https://www.customnightvision.com/product/ops-core-fast-sf-high-cut-ballistic-helmet/

Ops Core Fast XR:
https://www.hcctac.com/products/fast-xr-high-cut-helmet-system?variant=41502856544410

Agilite Helmet Covers:
https://agilitegear.com/collections/helmet-covers/products/ops-core-maritime-fastsf-helmet-cover-gen4?variant=12227562045509