The Zel Custom Spartan S3 Upper is engineered to meet the needs of shooters looking for a budget-friendly upper and the beefiness of a .308 sized upper. Applying a “keep it simple” approach to design and engineering, the Spartan receiver is built from four sub-components that are solidly welded and fastened forming a strong and secure foundation for an affordable and accurate upper.
Select from two styles to fit either the AR-10 or LR-308 style lowers. Lowers are not included, but are available separately.
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Available in .50 BMG, .416 Barrett and .338 Lapua. and in your choice of Ultralite (Mossberg) or Duty (Lothar Walther) barrels.
See more at http://www.tactilite.com/default.asp.