BudsGunShop.com - is it drilled and tapped?

Early Model 88s were equipped with a single slide rail, but this was updated to a dual slide rail in 1990. Also the Maverick 88 does not have a receiver top pre-drilled and tapped for a Weaver scope mount rail.

As has been stated the Maverick is not drilled and tapped for a scope mount. There is a 10 minute option/solution that is very easy and does not take a gunsmith. These mounts do work and are steady. They mount by replacing the trigger group pin and the ejector screw, just like the side saddle shell holders. Pros are That they are less expensive than having a gunsmith drill and tap for a scope mount, they can be easily removed and put on any Mossberg 500 series or Maverick gun, they don't permanently change your firearm, and you don't have to wait for it as you can do it yourself in less than ten minutes. - budsgunshop.com/catalog/product_info.php/products_id/36493/B-Square+Saddle+Mount+w%2FRings+For+Mossberg+500%2F835

Richard it would be easy to do or have done.

Richard, sorry it's not drilled and tapped, here are the specs he Mossberg Maverick 88 is known throughout the industry as the workhorse in the Mossberg shotgun line. The Maverick 88 is perfect for the sportsman who spends his time in the field hunting or at the range shooting. The Mossberg Maverick 88 has established a reputation as a solid, affordable shotgun which comes in a variety of configurations and has a excellent compatibility with aftermarket accessories. Don't hesitate to "pull the trigger" on picking up one of these exemplary models today.
Specifications and Features:
Mossberg Maverick 88 Slug Pump Action Shotgun 31017
12 Gauge
24" Smooth Bore Barrel
Cylinder Constriction Rate
3" Chamber (accepts 2-3/4" and 3" shells)
6 Rounds (5 in the magazine tube with 1 in the chamber)
Adjustable Rifle Sights
Cross bolt safety
Dual extractors
Twin action slide bars
Interchangeable barrels compatible with Mossberg 500
Length of Pull 14.25"
Overall Length 43.5"
Overall Weight 7lbs
Blued Metal Finish
Black Synthetic Stock/Forend