Hello I have this gas vsr 10. Comes with 3 mags and can have 99% of parts swapped with vsr 10 compatible parts. The bolt hold the co2, and to make it externally regulated you can use a mancract co2 system. The guns bolt can also be put in any other vsr 10 to make it GAS. Offer up. Has minor upgrades like the barrel Hopup Bucking Comes with scope.