363mm for TM M4A1
evo is lambda 1st anniversary model !
This brand is value price stainless steel barrel.
lambda One and Five are used the most precise material,those tolerance is 0.001mm class.
evo has +-0.01mm,so not as good as lambda One and Five.
But it’s better than SMART barrel.Because evo is stainless steel so strong to rust.
(SMART is also strong by plating but not the best prevention compared to stainless steel)
Also evo is value model so adopted simple shape as Tokyo Marui original.