Tie. One is for the gala. One is for the apocalypse.
: Though the player ultimately discovers Vault 15's command computer is destroyed, its former inhabitants left the vault decades prior to establish Shady Sands, which grew into the New California Republic (NCR). Structural & Environmental Showdown Combat Dynamics pasec v15 star vs fallout
Typically, the V15 utilizes a modern M-LOK or proprietary attachment system. The edges on the "Star" design can be slightly sharper due to the complex machining. If you run the rifle "slick" (without covers), you might find the texture abrasive on the support hand during high-round-count sessions. pasec v15 star vs fallout