michalfo1988 0 Posted June 17, 2018 Recently acquired a a&k m249 looking to upgrade the barrel the hop unit and hop rubber and I am curious as to what would be the best options any help would be appreciated cheers Share this post Link to post Share on other sites
Lozart 4,226 Posted June 18, 2018 Bullgear hop up is the go-to for the M249 (not cheap though) Share this post Link to post Share on other sites
Druid799 2,225 Posted June 18, 2018 Have a look on YouTube there’s a shit load on there for up-grading it (me personally I think your better off watching vids than asking advice on a forum , video V written word ?) where I got most of my knowledge from . Share this post Link to post Share on other sites
