Heckler & Koch MR556A4 Gas Vent Screws
Genuine HK gas vent screws to adjust the gas system on your MR556A4 rifle.
MR556A4 rifles will ship with the 1.3mm screw installed.
$33.00
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MR556A4 rifles will ship with the 1.3mm screw installed.
| Size | 1.3mm (Factory), 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm |
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