Mando Mercs Costume Club - Yes, modified Nerf Guns can be used as approvable costume accessories, but the key word is MODIFIED and non-functional. Note the amount of changes made to this
Modification | Nerf Wiki | Fandom
How to Mod a Nerf Gun: An Illustrated Beginner's Guide to the Hammershot - The Manual
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Modified Nerf Masterkey - Etsy Israel
Modded Painted Nerf Gun Lot Of 2 | eBay
Modded Nerf Elite 2.0 Eaglepoint : r/Nerf
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Modded Dart Zone Pro MK-1.1 | NerfGunAttachments | The Nerfer's eMall