would i be legal ??
The built in suppressors are much quieter that screw on type
Not always
I have several. Built in is always quieter. Please give me the brand name and model you speak of?
Generally integrally suppressed barrels are internally ported in the first section to reduce velocity, as well as having the baffle stack in the second section. This keeps a round subsonic which reduces secondary noise (when considering the powder blast to be the first noise, sonic crack is a secondary noise and the firearm's action is a tertiary noise).
A screw-on can on a 16" barrel will work well also, but a standard or HV .22lr round will normally be supersonic when leaving a 16" barrel's muzzle. This is why an integral can will generally be "quieter".
Or you could solve that problem by purchasing super sonic .22 ammo... ??? My personal opinion, if all you can hear is a click and poof firing closed action, it's better to have a suppressor to take off and put on anything else you have. I don't care if it's even a tiny bit louder in a semi-auto