If you're buying the integral barrels, installing them to guns in your inventory, and selling the result, that requires a manufacturing license.
If you're selling the integral barrels to customers, and/or installing them to the customer's already-owned 10/22s, then that's just a bit of gunsmithing done under your 01 FFL.
Installing an integrally suppressed barrel to a 10/22 does nothing to the gun's status as a regular title 1 firearm, unless the integral barrel winds up taking the barrel length under 16", at which point it's making an SBR in addition to installing a suppressor. In that case, you would once again have to have a manufacturing license - unless the customers all Form 1 their SBRs in addition to buying a Form 4 integral suppressed barrel from you, and have you install the suppressed short barrel to their already-owned and stamped Form 1 SBR 10/22s when both stamps have come back.