The HUB-14 is an enhanced J-arm alternative that can attach any dovetail mounted night vision optic to a traditional flip-up mount.
The GSCI J-arm connects a PVS-14 to common flip up mounts, can activate/deactivate the unit when flipped up, and can be rotated to either eye.
The GSCI Flip Up mount fits into any standard helmet shroud.
The PHG-7 is also known as a "skull-crusher" system and allows NVGs to be worn without a helmet.