Geissele SGB Black Super Gas Block 05-807B

Geissele Super Gas Block Black .750″ (05‑807B) is a low-profile, precision gas block engineered to fit under most free-floating AR‑15 and AR‑10 rails. Cast from 17‑4 precipitation‑hardening stainless steel and finished in black nitride, this block is built for long-term corrosion resistance and rugged reliability. It supports Geissele’s “bombproof” installation method using a coil pin, ensuring the block never shifts under recoil, and includes a stainless steel alignment pin for perfect indexing on CHF barrels.

• Material: 17‑4 precipitation‑hardening stainless steel
• Finish: Black nitride
• Fits .750″ gas block journal diameter—AR‑15/M4/AR‑10 type uppers
• Includes: bombproof coil pin, SS alignment pin for CHF barrels, gas tube pin and two set screws
• Weight: approx. 1.6 oz; dimensions ~0.997″ L × 1.043″ W × 1.411″ H
• Installation options: set‑screw or pinned (bombproof method)
• Made in the USA with investment-cast precision and corrosion-resistant strength