Accessories: Included Removable Shroud Included Holster Optional flared magwell-- Engineered for smooth, intuitive magazine changes under pressure. Optional 6" Barrel for increased velocity (longer than an MP5K despite shorter OAL Important Compatibility Notes: Do not use short (standard) P365 slides. Recommended slides: P365XL, TACOPS, or P365 FUSE. Works with 17-21 round P365 magazines. Not compatible with 12-15 round magazines. Suppressor Clearance - Designed with ample space to accommodate most common pistol suppressors without interference 365 Aluminum holster, magwells and shroud are not compatible with the ultra light.