Other Details Manufacturer: Gemtech Manufacturer Part Number: 12143 Additional Feature 1: Fits Arrow QM Suppressor Adjustable Objective: False Caliber/Gauge: .338 Lapua Magnum canDropship: True Drilled and Tapped: False Illuminated Reticle: False NFA Thread Pattern: 5/8x24 Product Type: Accessory-Muzzle Brakes Scope Cover Included: False