5KU Full Metal Outer Barrel for M4/M16 Series Airsoft AEGs (Length: 12.5" / M4 Profile)

"This barrel is TIGHT! You will not need to do the Teflon tape mod, or use stabilizers, because there is almost no extra room around the inner barrel. This is not necessarily a problem, but the shallow area for the hopup unit is. The Lonex aluminum hopup unit is too big for this barrel. I had to shave down the plastic retention clip, and will more than likely need to file down the side wing pieces on the unit to get it to fit properly inside the chamber. Most stock hopups will likely be fine.

Pros
- Tight fit, no wobble
- Rifle length gas tube position (12" if you care)
- Looks Great

Cons
- large hopups will not fit, (LONEX WILL NOT FIT WITHOUT MODS)

"I got this barrel for my g&g combat machine gun and I had to modify the barrel but the barrel is awesome.

"i like this barrel except for 1 small flaw which is it isnt entirely 1 piece. the entire shaft itself is secured into the piece that fits into the receiver by only 2 grub screws on the vertical. since there arent any screws on the horizontal, mine had some left and right wobble. the wobble might only be present on the longer barrels like mine was the 20". i fixed the wobble by drilling two holes in the straight notches on each side and put in a grub screw in each side. the 20" barrel does have notches for a gas block mounted front sight

"i suppose the quality is nice but the paint finish on the threads is much too thick. Will have to do some modification to thin the pain or completely sheer it off. Also, my barrel came loose so make sure u have a SMALL allen key.

"If you want a wobbly two piece barrel this is for you. If you don’t want your barrel to wobble around so you can actually shoot with accuracy buy a one piece barrel like matrix. Absolute garbage

"this barrel is pretty bad just plain and simple. first off there was excess material inside of the barrel itself which I had to use an old inner brass barrel to scrape off the excess junk off. Secondly, it does not do not support metal flash hiders to the point I don't even think its 14 mm.

"The barrel is a two piece barrel, it wobbles and the screw to tighten it comes loose easily, I was about to play my first game with the new barrel it before the game could even start, the barrel came loose and fell straight out.