Manufacturer: Innovative Arms
The Grunt® is compact and lightweight. The patented one piece core is machined from billet bar stock and has no internal welds. The GRUNT is direct-thread on in 1/2 x 28 and is full auto rated on barrels down to 10″. It also features wrench flats that allow easy pin and weld for short barrels and is available in Black, OD Green or Flat Dark Earth. For the most compact size check out the GRUNT-M (mini). Caliber: 5.56mm Weight: 17.5oz Length: 6.25” O.D: 1.5″ Material: Stainless Steel Finish: Black, OD Green or Brushed Stainless TPI: 1/2 x 28 DB Reduction: 32-35 Dry FULL AUTO RATED
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