Description
Tinck Arms — 3-Position Adjustable Gas Block (MR556 / MR223 / HK416 compatible)
Precision-machined gas block designed to convert MR556 / MR223 rifles to the modern A5-style gas system while offering reliable, tunable performance for both suppressed and unsuppressed use.
Key features
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Hardened steel construction with black Melonite finish for long wear resistance.
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Titanium leaf spring for positive indexing and long service life.
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3-Position selector:
- N (Normal): Standard ejection-port vent closed for unsuppressed use.
- SS (Semi-Suppressed): For semi-suppressed use.
- FS (Fully-Suppressed): For fully suppressed use.
Three-position — tune perfectly for your suppressor.
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Pre-installed gas vent screw: 1.3 mm (factory installed).
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Additional jet sizes included: 1.1 mm and 1.5 mm – swap quickly to tune gas flow for different barrels, ammo, or suppressor setups.
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Rear-pin retention like the factory HK416 A5 (held by rear pin only).
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Ejection-port side vent with selector cap — easily switched between modes
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Indexing tab: 3 mm width with a 0.75″ profile
Compatibility
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HK416 series
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MR556 / MR223 platforms
- For MR556 A4 you are risking misalignment because the tab is to small
Note: Not intended for use with barrels under 11″, due to interference between the adjustment knob/cap and muzzle device or suppressor. May require barrel/gas port modification.
Listing one-liner
Premium 3-position adjustable gas block — MR556/MR223 & HK416 compatible, 1.3 mm pre-installed jet + 1.1 & 1.5 mm spare jets, N / SS / FS modes, 3 mm indexing tab with 0.75″ profile.
