Timerzanov Airsoft shows off the A&K FN M249 MKII AEG that with a custom gearbox made by Vinc... "Hi all ! Today I offer you the review of an M249 from A&K. This is Vinc's replica of Gearbox Custom Airsoft that he completely upgraded by himself. So in this video I show you what it is possible to do with any replica with an M249 A&K type gearbox. So I wish you a good video!