The Strike Industries AR Enhanced Castle Nut & Extended End Plate should work fine with the HK416 or MR556.
The AR Enhanced Castle nut & extended End Plate will install and work on the MR556.
Yes. I have it on mine.
The Strike Industries AR Enhanced Castle Nut & Extended End Plate should work fine with the HK416 or MR556.
The AR Enhanced Castle nut & extended End Plate will install and work on the MR556.
Yes. I have it on mine.