Reliability Enhancement Kit (REK) - H3

Geissele AR-15 Reliability Enhancement Kit 5.56x45mm H2

Geissele AR-15 Reliability Enhancement Kit 5.56x45mm H1

Armaspec SRS Gen 4 Buffer-H3 Kit, Black - Superior Buffer Technology for Maximum Recoil Reduction - ARM263-H3

Armaspec SRS Gen 4 Buffer-H Kit, Black - Heavy-Duty Buffer for Improved Recoil Control - ARM263-H

Armaspec SMB Gen 3 Buffer-H3 Kit, Black - Maximum Recoil Reduction - ARM268-H3

Armaspec SRS Gen 4 Buffer-H2 Kit, Black - Advanced Recoil Management with Heavy-Duty Buffer - ARM263-H2

Armaspec SMB Gen 3 Buffer-H Kit, Black - Heavy-Duty Buffer Kit for Enhanced Recoil Management - ARM268-H