Actually, Dave3006 comes closer to what I do that any rifle. Never backpacked with a rifle except when doing a dedicated big game hunt.
Although not a "real pistol,"
I usually pack a S&W (yeah, I know, but was bought before the sell-out) 317.
At 11oz (empty), holds 8 rounds .22 LR, adjustable sights, plenty accurate (moreso than me), an extra box o' 50 to plink weighs (?) next to nuttin' and did I mention 11 oz?
Really. So light, I do have to keep checking that it's still there.
If you want to go .22LR & still stay way lightweight, I cannot think of (or find) anything that fits the bill so well.
You asked about rifles .... I don't carry 'em when I don't have to.
Sounds like Feather's back in business too ... may have to check into that ... never too many .22s ....