AR15 M4 Buffer H3, HEAVY, 5.2oz (For M4 rifle)
Will also work in AR10 with approriate Buffer Tube.
There are several different Buffers out there.
Here is the nomenclature:
Buffer STD for AR15 M4 rifle (3,0 oz = 85 gram)
Buffer H1 for AR15 M4 rifle (3,8 oz = 107 gram)
Buffer H2 for AR15 M4 rifle (4,6 oz = 130 gram)
Buffer H3 for AR15 M4 rifle (5,2 oz = 147 gram)
Please note that weight may vary from different suppliers.