Other Details Manufacturer: Gemtech Manufacturer Part Number: 12142 Additional Feature 1: Fits Arrow QM Suppressor Adjustable Objective: False Caliber/Gauge: .338 Lapua Magnum canDropship: True Drilled and Tapped: False Finish: Black Illuminated Reticle: False Material: Steel NFA Thread Pattern: 3/4x24 Product Type: Accessory-Muzzle Brakes Scope Cover Included: False Threads: 3/4-24