What is the fine-grained topic of the following text: The Bushmaster BCWVMS-16-45 E2S 450 Rifle in .450 Bushmaster features a 16-inch chrome lined heavy barrel, black finish, forward assist brass deflector, A2 fixed buttstock, no sights, aluminum free floating tubular forend, Izzy flash hider, black thermaplastic pistol grip, an overall length of 34.25 inches, an unloaded weight of 8.25 lbs, and a 5+1 round capacity. Only return the topic.
Bushmaster BCWVMS-16-45 E2S 450 Rifle specifications