CMMG Buffer 9MM Buffer for AR15 M4 Carbine rifle

This Buffer is much heavier than original AR15 buffer.
Weight: 152 Gram.
It´s a must have when shooting pistol Caliber in your AR rifle with heavy boltcarrier.
(This buffer is not for CMMG RDB system.)

(The same product is manufactured by Rock River Arms
Item nr AR15-32-9MMBUFF )

Buffer 9MM for AR15 M4 Carbine Mk9 Blow Back 
Color of Buffer may be different.

There are several different Buffers out there.
Here is the nomenclature:

Buffer H0 for AR15 M4 rifle (Std buffer) (3,0 oz = 85 gram) 55CA977
Buffer H1 for AR15 M4 rifle (3,8 oz = 107 gram) 55CA97B
Buffer H2 for AR15 M4 rifle (4,6 oz = 130 gram) 55CA92C
Buffer H3 for AR15 M4 rifle (5,2 oz = 147 gram) 55CA9FD
Buffer 9MM version AR15 Heavy Bolt (PCC Blowback)(5,36 oz = 152 gram) 90CA9B4
Buffer 10mm AUTO CMMG M4 rifle (8,0 oz = 227 gram) 10CA976
Buffer AR10 308 Carbine Buffer (Short Version) 308CS10B 
Please note that weight may vary from different suppliers.