Michael, this shotgun has a 4 round capacity tube magazine and with 1 shell in the chamber is a (4 +1) or total capacity of 5 shells.

its 4+1 Specifications and Features:
20 gauge
Semi automatic
21" vent rib barrel
3" chamber
*********4 +1 rounds capacity
Solid steel receiver
Adjustable length of pull kit allows up to 1" of adjustment
Single bead sight
Synthetic stock and forend
SuperCell recoil pad
Overall length 40.25"
Drop at comb 1.5"
Drop at heel 2.5"
Weight 6.5 lbs
Black

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Hi Michael, Yes It's 4 + 1.

Yes you are correct. It’s 4+1