They are fire breathing dragons.... just keep it lubed and run quality ammo and you are all good. They are louder and get dirty quicker but they also are full as hell.... As noted by USp you need the correct buffer setup. I also realy like the units that are being produced by spike ( I have 2 lowers from them)
I have a 7.5 in 5.56 and 9mm and a 10.5 in 5.56 and they all run without any issue when are properly lubed. They do choke when dirty and dry.
Anything shorter than 16" is inadmissible to the USA. (If that matters to you.)
I'd consider that to be a disadvantage.



























