The new Recon Tippmann AEG M4 guns include standard V2 metal gearboxes, Mosfet unit, metal bearings, high quality components (Lonex OEM), high quality solid polymer body and receiver. Full metal M-Lok rail system which includes standard weaver rail adapters that are removable on the bottom and sides (3 total). Features a quick-change spring system. It's a solid, hard hitting, consistent shooting AEG right out of the box.