Description
Additional 5 M-Lock slots on each side.
6 7/8″ inches of additional picatinny rail
The ERS Combined with a 5.5 inch barreled MAT9-K upper requires the use of a 7.25 suppressor or blast forwarding device at minimum.
Swapping the barrel to an 8 inch will allow you to run a shorter 4.25 suppressor without risk of injury.