Yes, Buds' titles are not always 100% accurate so I prefer to check the manufacturer catalog which in this case lists this model as: 5.56mm NATO/223 REM . Here's that catalog page: mossberg.com/wp-content/uploads/2015/05/MOSSBERG--_MVP--_LR_RIFLES.pdf

it is a 5,56 so you can use .223 ammo with no issues see ******Featuring an integrated adjustable comb built into the synthetic stock and a medium profile fluted bull barrel with a threaded muzzle, the Mossberg MVP LR is the long range work horse you've been waiting for. It accepts readily available AR-15 pattern magazines. The rubberized adjustable check rest and adjustable LBA trigger will give you a custom fit for your shooting style. When the need arises to challenge yourself at long ranges you're going to need a rifle that can satisfy, and the Mossberg MVP Long Range is more than up to the task. The MVP LR is capable of pinpoint accuracy at the types of distances you have been dreaming of. So whether your needs are for harvesting that trophy, or scoring in the X ring, the Mossberg MVP LR should be the rifle in your hands.
Specifications and Features:
Mossberg MVP Long Range 27696
Bolt Action Rifle
***************5.56 NATO (accepts .223 Remington)
10 Round Detachable Box Magazine
Accepts AR-15 Pattern Magazines
20" Medium Bull Barrel Fluted
1:7" Twist Rate
Threaded Muzzle
Picatinny Rail
OD Green Synthetic Stock
Sling Swivel Studs
Matte Blued Finish
Length of Pull 13.25"
Overall Length 39"
Overall Weight 7.5 lbs

Lithideth, yes. The Barrel is Stamped 5.56NATO so .223 Ammunition can be safely fired.

Lithideth, yes. The Barrel is Stamped 5.56NATO so .223 Ammunition can be safely fired.

Lithideth - it is perfectly acceptable to use 5.56 ammo in this rifle, according to the Mossberg web site. The .223 is, generally, a bit less expensive than 5.56.