Depends on the individual rifle... maybe the liner type you use.
Early days they pushed them out too early and rightfully got roasted. The Mkii is generally considered to be sorted.
The modularity and ability to tune to a power level or pellet/slug and the abilty to swap out cals is a boon in FAC.
Its on my list. Mate just got an FAC one and is impressed. Plus they encourage third party manufacturers and work with them.
Good rifle imho. Tweakable to where you want it to be if thats a benefit. Some may view tweakability as a PITA
In a battle of wits I refuse to engage with an unarmed person.
To one shot one kill, you need to seek the S. Kill only comes from Skill