Michael Mihalski, Author at Primary & Secondary

DPMS Oracle 5.56 Rifle Autopsy: An Armorer’s Inspection

September 16, 2026October 6, 2015 by Michael Mihalski

DPMS Oracle 5.56 rifle prepared for detailed armorer inspection

A detailed armorer inspection of one factory-new DPMS Oracle 5.56 rifle, covering receiver assembly, staking, fasteners, bolt-carrier components, gas-system choices, materials, dimensions, and torque observations.

Why DIY AR-15 Gunsmithing Can Go Wrong

September 13, 2026September 29, 2015 by Michael Mihalski

A failed barrel modification shows why AR-15 reliability depends on the complete operating system—and why diagnosis, proper tooling, inspection, and testing must precede irreversible work.