Dekuriru talks about how to maintain the M249 Sportsline AEG from S&T in this video... "In the last airsoft game, a female member said that even a 3kg electric gun is heavy... This time it's a maintenance video of the S&T electric gun M249 Sports Line. It weighs 3700g, so it was much lighter than the full metal M249 made by A&K. One way is to pay a shop to do the maintenance, but I don't have the money, but I have the time, and if there's something I can do myself, I'd like to do it! Personally, I think there is. I won't reveal the name of the shop, but I've seen many times where things broke right away even after they were repaired. I've seen some people brag about the fact that the customization fee is higher than the actual price. However, I felt that this air gun was relatively easy to disassemble and easy to maintain even for individuals. You don't need any special tools, so I hope this video will be helpful for those who are thinking of trying it out."