Classic Army NF002P-DE M4 RIS EC1 Skirmish Nylon Fiber AEG - Dark Earth Spring Sniper you can use this with

you can use this with any other barrel that is this same OD +/- 0

the AT Pipe allows Air Transfer from the ASA on the bottom of the frame into the foregrip-mounted SL4 Inline Regulator without the need for hoses or fittings

Not a shotgun blast or a disc distribution

HI-cap magazine

Classic Army NF002P-DE M4 RIS EC1 Skirmish Nylon Fiber AEG - Dark Earth Spring Sniper you can use this withThe M4 RIS EC1 Nylon Fiber is Classic Army's entry level carbine. Utilizing Classic Army's nylon fiber allows for a lighter weight platform while ensuring playable durability in a cost efficient package. The M4 RIS EC1 Nylon Fiber features a high rate of fire along with a 300rd high capacity magazine so you can put more BBs on target faster than you can count. It also features a quad rail system for attachments of lights, lasers, bipod, or forward