Charlie's Custom Clones stocks a curated selection of Mk11 and M110 Semi-Automatic Sniper System upper receivers, barrels, and components for builders chasing the definitive GWOT-era semi-auto precision rifle configurations. The Mk11 Mod0 and Mod1 — chambered in 7.62x51mm NATO and fielded by SEAL Teams, DEVGRU, and SMU snipers — and the U.S. Army's M110 SASS represent the two most widely deployed semi-auto sniper platforms from the post-9/11 era, both built on the SR25/AR-10 pattern with Knights Armament Company components at their core. Our inventory includes KAC-marked upper receivers, match-grade 20" and 18" stainless barrels, URX and M110 free-float rail systems, bolt carrier groups, and ancillary components needed to complete or restore these iconic platforms. Whether you're building an authentic Mk11 Mod0 clone for display, restoring an M110 to factory configuration, or sourcing hard-to-find KAC parts for a functional precision build, this is your source. All components are vetted for period-correctness and clone accuracy. Browse our current stock below — availability is limited and changes frequently.