Aim Sports Zero Hour Micro Gas Block — .750" Low Profile — Model ZHMGB01 — UPC: 815879014795
Upgrade your rifle’s gas system with the Aim Sports Zero Hour Micro Gas Block (ZHMGB01) — a precision-machined, low-profile gas block engineered to deliver consistent, reliable gas flow in compact, lightweight AR builds. Built for shooters who demand tight tolerances, repeatable alignment, and a minimalist profile, the Zero Hour Micro seamlessly integrates with free-float rails and low-profile gas tube systems while providing a rock-solid mounting platform for your gas tube and forcing cone interface.
Engineered for Precision & Minimal Profile
The Zero Hour Micro Gas Block is designed specifically for barrels with a .750" (3/4") gas journal diameter and accepts standard low-profile gas tubes. Its compact footprint allows for optimal rail clearance and unobstructed handguard installation, making it ideal for modern sporting rifles, precision builds, and short-barrel carbine setups where space and alignment are critical.
Premium Construction & Finish
Crafted with attention to long-term durability, the Zero Hour Micro is precision-machined from hardened steel to resist deformation and maintain perfect gas-port geometry under repeated firing cycles. A wear-resistant protective finish reduces corrosion and provides a low-glare tactical appearance that matches modern blacked-out builds.
Material: Precision-machined hardened steel
Finish: Durable low-glare corrosion-resistant coating (black)
Tolerances: Tight bore and port tolerances for consistent gas delivery and minimized blowback
Key Features & Benefits
Low-Profile Design: Keeps the gas block tucked under slim handguards and free-float rails for clean lines and maximum rail real estate.
.750" Gas Journal Fit: Engineered for barrels with a standard 3/4" gas journal — ensure compatibility before purchase.
Accurate Gas Port Alignment: Machined gas port and pin clearance ensure positive alignment with the barrel gas port and gas tube for reliable cycling.
Lightweight: Micro form factor minimizes added mass on the muzzle end of the rifle, preserving balance and handling.
Robust Mounting: Secure fastening via the supplied hardware (set screws, roll pin, or both depending on package) for a worry-free hold under recoil.
Versatile Use: Excellent for carbine-length, mid-length, and some pistol gas systems when matched to proper barrel specifications.
Tactical Aesthetics: Matte black finish integrates seamlessly with black rails, barrels, and other furniture.
Compatibility & Fitment Notes
The Zero Hour Micro fits barrels with a .750" gas journal (commonly used on AR-15 style barrels). Before ordering, verify your barrel’s gas journal diameter and gas port location. This gas block is intended for use with low-profile gas tubes and free-float handguards. If your build uses an oversized gas journal, specialty barrels, or non-standard gas systems, consult the barrel manufacturer or a qualified gunsmith for fit confirmation.
Installation Overview & Best Practices
Safety First: Always ensure the rifle is completely unloaded and the chamber is clear before any work.
Alignment: Proper alignment of the gas block to the barrel gas port is essential for reliable cycling. Center the gas port and ensure the gas tube passes freely through the block without binding.
Mounting Hardware: Use the hardware supplied with the block. Some installations may use set screws only; others may require a roll-pin or a combination. Follow Aim Sports’ included instructions and torque guidance.
Gunsmith Recommended for Precise Work: If you’re uncertain about alignment, staking, or torque, have a competent gunsmith perform the installation — proper alignment and secure mounting are critical for safe, reliable operation.
Function Check: After installation, perform a live-fire function check with inert or live rounds (per local laws) to verify proper cycling, timing, and gas system function.
Tuning & Suppressor Use
A low-profile micro gas block like the Zero Hour can be part of a well-tuned gas system. If you intend to run a suppressor or specialized ammunition, be aware that back-pressure and gas volume can change. Suppressed use may require gas system tuning (different buffer, gas key, or adjustable gas block) to achieve the desired reliability and felt recoil. The Zero Hour Micro is a solid fixed-block solution in lightweight builds; for adjustable tuning, consider pairing it with dedicated adjustable solutions when mission requirements demand.
Maintenance & Longevity
Inspect periodically for tightness of fasteners and match between gas block and gas tube.
Keep the gas port clear of excessive carbon build-up; light cleaning during regular maintenance will preserve consistent gas flow.
Protective finish will resist corrosion, but avoid prolonged exposure to saltwater or corrosive agents without proper cleaning.
Ideal Applications
Low-profile AR-15 carbine and pistol builds
Lightweight hunting or patrol carbines needing a flush gas block footprint
Free-float handguard installations where rail clearance is limited
Builders focused on minimal-mass and clean aesthetics without sacrificing functional reliability
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Final Thoughts
The Aim Sports Zero Hour Micro Gas Block (.750" Low Profile, Model ZHMGB01) is an excellent choice for builders who want a precision, low-profile gas block that stays out of the way while delivering dependable gas-system performance. With hardened steel construction, tight tolerances, and a minimalist footprint, it’s ideally suited for clean, modern AR builds that require unobstructed handguard clearance and reliable cycling. Always verify barrel compatibility and follow proper installation practices for best results.
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