This BCA AR-15 Complete 450 Bushmaster Bolt Action Style rifle length upper has a 16" heavy barrel with a parkerized finish, and features a 1:24 twist rate. It includes a 15" MLOK rail, an M4 flat-top billet upper receiver, a BCA bolt carrier group, a flash hider, and a right-side bolt action style charger. This 450 Bushmaster upper is compatible with any mil-spec AR-15 lower. Customers in the states of CT, IL, and WA can ONLY purchase a bolt action style product from our website. Adding any other product to your cart will not allow you to check out. Shop more .350 Legend Uppers! Magazine not included. Check out Magazines here! {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="56"}} *Note - We strive to provide the most accurate photographs of our product. Variations may occur in the skeletonized section of the handguard/flash hider you receive. {{widget type="Magento\Cms\Block\Widget\Block" template="widget/static_block/default.phtml" block_id="42"}} It is the responsibility of the consumer to ensure all state, local, federal, and ITAR regulations are followed