Actions offered 100% parts interchangeability. For the first time in the history of the MK13, any part from any Stiller-based rifle could be interchanged with the same part on a different rifle with no change in function or accuracy.
Stiller MK13 actions are black nitride coated and subject to a specially developed, rigorous QC process that holds our already industry-leading tolerances to within a half thousandth of an inch.
Receiver Length: 8.700”
Receiver Diameter: 1.35” (Remington 700)
Headspace: 1.100” Headspace tolerance is held to +/- .0005”
Bolt Design: 700” diameter
One piece fluted on top and sides but not the bottom so that flutes will not interfere with magazine lips. TAC actions have straight bolt handle and PREDATOR actions have swept bolt handle. Bolt knob is threaded. TAC actions have large knob and PREDATOR actions have small knob. Aftermarket knobs can be swapped out by user or gunsmith.
Bolt Throw: 90 degree
Bolt Material: Chrome Molly hardened to 42 Rockwell
Bolt Coating: Proprietary double layer coating makes them as smooth as glass
Firing Pin: Fluted Stainless Steel, .068 diameter tip, Chrome silicon spring
Extractor/Ejector: Modified M16 type extractor, Rem 700 style pin ejector
Recoil Lug: 416R Stainless parallel sided or tapered. .187” (Rem700 standard) or .300” produced in house and surface ground to .0002” tolerance.