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Low Friction B/J Upper Bolt-In Metric GM +1/2in
Low Friction B/J Upper Bolt-In Metric GM +1in
Low Friction B/J Upper Bolt-In Metric GM Std
Low Friction B/J Upper Screw-In + 1/2in
Low Friction B/J Upper Screw-In + 1-1/2in
Low Friction B/J Upper Screw-In + 1in