The magazine size for this weapon is "1", instead of being "0" like other non-automatic ship weapons. This causes the "recharge" indicator on the ship HUD to simply switch from "0" to "100" when it's recharged, instead of smoothly recharging like other non-automatic ship weapons.
Form ID 002184B7 [WEAP]
1.7.36.0
Yes
Observe the recharge rate in game, and look at the WEAP record in Starfield.esm via xEdit.