THIS IS THE FIRST ONE I’VE EVER WORKED ON
LCT M16 A4 & from what I can tell without doing any fucking research, the rail system and the gearbox are very clearly BOLT.
It’s as sturdy as any LCT gearbox internally but that does mean it’s a bit noisy as well.
It’s 6 years old and it’s been used quite a lot of times and as such was pretty bastard wobbly but once I sorted all of that out it’s quite possibly the sturdiest M16 I’ve ever had my hands on.