Headspace on 20ga question?

[Spcamno]

Anybody knows how to measure headspace on a 20ga shotgun specifically Savage 220 with fully rifled barrel?

I want to retrofit the current stock to an Accufit stock (with aluminium bedding insert) which appears the recoil lug is different, found the lug online but need to remove the barrel to swap it.

Just want to see what's involve and is this worth while also, anybody knows if ordinary 20ga headspace gauge will work on rifled bore?

Thank you in advance!

 

[Lodi]

Rifling or no rifling, this does not affect headspace. A standard headspace gauge will get the job done.