Easily accessible without tools simply by pressing the release tabs on the buttpad (sold separately). Dot coded to indicate functions. The M:4 is a patent pending 1-piece multi-tool for the M4 carbine designed and manufactured by MultiTasker® in conjunction with B5 Systems. Tools: slotted screwdriver, castle nut spanner, 1/2″ hex for scope mounts, and bolt overridePrecision machined from barstockNests inside the b5 systems buttpad