what does the dart holder do?

You’re kidding right? It’s a magazine NOT a “dart holder”. A magazine is a “dart holder”

Do I need to buy batteries for this gun?

No, this is not a battery powered gun, you have to "cock" the gun each time you want to shoot. One of the fastest non battery powered guns out there.

Does this gun have slam-fire (the ability to hold down the trigger and pump out rounds?)

yes it has some of the best slam-fire (did not buy this from amazon)

will the darts work in the nerf retailiatior?

Yes, they both fire the blue nerf n-strike elite darts. Also, mine is able to fire the nerf barricade whistler darts and the generic nerf suction cup darts with no modification.

Product Dimensions	11.3 x 54.1 x 34.11 cm; 1.25 kg
Batteries	1 AA batteries required.
Manufacturer recommended age	0 - 5 years
Item model number	98697F01
Language:	English, Italian, French, German, Spanish
Number of Game Players	Multiple players
Assembly Required	No
Batteries Required?	No
Batteries included?	No
Material Type(s)	Plastic
Remote Control Included?	No
Colour	Multicolor
Release date	1 Aug. 2018
ASIN	B00DW1JT3I

NERF Rampage N-Strike Elite Toy Blaster with 25 Dart Drum Slam Fire for Kids, Teens, & Adults (Amazon Exclusive)

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