From Magpul -
The Second Generation MBUS is now shipping. Compatible with all Milspec 1913 Picatinny rails, MBUS2 features a slimmer profile for increased optics compatibility and a positive detent to securely lock the front sight post in place. Lightweight reinforced polymer construction keeps added ounces to a minimum, while the spring loaded folding design ensures that the MBUS2 will stay out of the way until you need it. All mounting hardware included. MBUS2 Front includes sight post adjustment tool.NOTE: Front MBUS2 is not compatible with railed gas blocks.
It is a sleeker, slimmer MBUS using everything they learned from MBUS. Nice upgrade IMO.
Originally Posted By AR15fan:
What different from GenI ?