The ready to be tapped for HPA use JAG Arms TS Scattergun is available at Airsoft Atlanta... "The new 2017 Jag Arms TS Railed version Scattergun Gas Shotgun in Black. This is a green gas powered airsoft shotgun, with an internal buffer tube (integrated) tank reservoir that holds many shells worth of gas. The Jag Arms shotgun is a 1:1 clone of the original Tokyo Marui M870 from Japan.