The stock base adapter includes a M4 style buffer tube adapter and 1913 style 20mm picatinny style adapter for ease of installing your favorite stocks

285mm precision inner barrel

The reason for the GEN2 actually has to do with simplifying manufacturing rather than any change in how the regulator functions or performs

Weighs 8 ounces

PCU Aluminum Shotgun Tracer Unit for Standard 870 Breacher tokyo marui The stock base adapter includesFits Standard: Tokyo Marui: M870 Breacher Jag Arms: Scattergun Super CQB Scattergun SP Scattergun SPX Scattergun SPX2(it is necessary to modify top rail) Scattergun Reaper Secutor arms: Velites (invicta) GII Velites (invicta) GIII Velites GV Velitas GVI Golden Eeagle: M8874 M8875 M8876 M8877 M8878 M8879 M8881 A Full Aluminum Construction and modularity make this tracer unit the ultimate tracer for M870 style shotguns. The amazing battery efficiency