Impact Precision NBK action brings you everything you love about Impact’s flagship 737R in a lightweight setup ideal for your next hunting rifle. The Impact NBK utilizes the same barrel tenon/headspace specs as the 737R and can readily accept 737R prefit barrels.


  • This standard 737R bolt body comes with an aluminum shroud and knob.
  • The receiver is one piece with an integral recoil lug and a 20 MOA Picatinny rail.
  • Integral Recoil Lug is .240 thick
  • Action comes standard as AW compatible allowing for AICS and AW mags.
  • Action weighs in at 28oz
  • The overall length of pic rail is 1.865″ Front and 1.765″ Rear
  • Utilizes a mini M16 style extractor and plunger ejector
  • Receiver is rough machined, heat treated, bolt races are EDM’d, and finish machined to ensure exacting dimensional tolerances.
  • The one-piece bolt is designed with proper geometry and clearance to allow smooth operation under field conditions.
  • Fluting on top and sides of the bolt body carries dirt away while a smooth bottom portion ensures smooth cycling.
  • Receiver headspace and index tolerance allow actions and barrels to be purchased off the shelf and USER INSTALLED.
  • Rugged bolt stop design can take abuse while not requiring modification to stocks or chassis.
  • Remington 700™ style action footprint allows compatibility with most available stocks and chassis. The KRG Chassis line requires machining for trigger hanger clearance!!
  • Trigger Hanger allows simplified field maintenance to the trigger.
  • Utilization of Remington 700™ style triggers allows a wide range of trigger options.
  • Black carbon nitride finish improves operation by increasing surface hardness and lubricity.

Couple Impact Precision NBK Action with one of our prefit barrels!

FFL is required at the time of shipment but NOT the time of order. Please email your preferred FFL to