Not sure which one you have but:
http://www.actiontec.com/support/product_details.php?pid=188&typ=all#q27
Can I Bridge the Actiontec MI424WR router that Verizon provided, when I signed up for FiOS service?
The MI424WR does not have a bridging option, and neither Verizon nor Actiontec support attempting to bridge it.
The desire to bridge the MI424WR is based on a misunderstanding that it is a modem as well as a router. Actiontec does produce DSL Gateways that have a Transparent-Bridging option, which bypasses or disables the router function and allows the Gateway to act simply as a DSL modem, when it is enabled. Many consumers do not realize that with FiOS, the ONT (typically outside the home) is the device that handles changing the FiOS signal from Fiber to either Ethernet or Coax, and that the Router is just a Router, and if it was bridged or bypassed, it would be a device without a function. For most Verizon FiOS customers their service would completely stop if the MI424WR was bridged, because the Video on Demand service is dependent on it to work.
If your ONT is connected to the Actiontec MI424WR router via Coax, the MI424WR is required due to the Coax connection. But if the ONT is connected to the MI424WR via Ethernet, then in most cases some other router can be substituted for the MI424WR, and it can be removed.
So not sure. I couldnt bring up the PDF, so it doesn't look good. Seems that its not actually a modem/router combo but a router via MoCa and might be the heart of some of the DVR's functions in your house. Might want to send Verizon a Anom email to find out. Anom just in case they don't like you doing it. Good luck