The Swissarms version of the Sig 550 is a non restricted firearms as is the Isreali Tabor
Although it is a pain to have a 30 round mag pinned to 5 rounds
The pinned mag is one reason I have zero interest in an AR type firearm. In a SHTF scenario the 5 rounds would be........How many 5 round mags can a guy carry? Makes more sense to carry a lever gun capable of having up to 10 rounds avail or a short barrel 12g with mag extender. The shotgun is likely the optimal tool as in a number of cases you could have a longer barrel for food gathering plus a shorter barrel with a mag ext for defensive puposes.
Regardless of your firearm choice, rifle or shotgun, be it a semi, lever, bolt or pump action, practice with it till you become proficent with it as both a food gathering and defensive tool. Regardless, we need to support one anothers choice. A hand gun would be a nice addition too.
