Downloadable Manuals for SIONICS MCTR MANUAL AND SPEC SHEET R1 MANUAL S15 MANUAL SIONICS Patrol Rifle Three ManualDownload SIONICS S-15 Handguard Manual Download SIONICS V3 Handguard Manual (For use with 10.8″ 13.5″ & 15″ HandguardDownload SIONICS V4 Handguard Manual (For use with 11.8″ HandguardDownload