Spartan 50 BMG Upper Receiver for AR 15, available in .50 BMG, .416 Barrett and .338 Lapua Spartan 50 BMG Upper Receiver for AR 15, available in .50 BMG, .416 Barrett and .338 Lapua Spartan S3 Upper Receiver for AR-10 and LR-308, available in .50 BMG, .416 Barrett and .338 Lapua
Spartan S3 Upper Receiver for AR-10 and LR-308, available in .50 BMG, .416 Barrett and .338 Lapua Spartan 50 BMG Upper Receiver for AR 15, available in .50 BMG, .416 Barrett and .338 Lapua