NBS AR-15/M16 Helical Gas Ring
$3.95 0 in
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Specifications
Caliber
Model
Helical Gas Ring
MSRP
$3.95
Fits
AR-15/M16 bolt carrier group
Material
Spring Steel
Platform
AR-15
Description
Single spiral of spring steel loops around the bolt three times and leaves no path for gas leakage. Replaces conventional three-piece "piston ring"-style sets that can accidentally line up, causing a major leak from the gas expansion chamber in the carrier.