Complete Varmint Upper: Criterion 1-8


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This varmint upper is built on a MIL Spec A4 receiver with MIL Spec complete bolt carrier assembly, charging handle with an AERO Quad Rail FDE handguard.

Criterion Varmint
Twist: 1-8
Length: 20″
Chamber: Wylde
Gas System Length: Rifle
Gas Block Area: .875
Threads: 1/2-28
Flutes: Standard


  • Manufactured by: Compass Lake Engineering

Additional information

Barrel Brand



Chamber Type

Gas System Length

Handguard Length

Barrel Fluting



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