Primary Weapons Systems MK2 MOD 2 Complete Lower Receiver

A complete lower takes the fiddly half of a build off the table. Primary Weapons Systems assembles the MK2 MOD 2 with the fire control group, safety, grip, and stock already fitted, so finishing a rifle comes down to dropping on an upper and running a function check. The receiver is marked multi caliber, which is standard for large frame lowers that get paired with anything from 308 Win to 6.5 Creedmoor.

PWS builds the MK2 as its large frame platform, and the MOD 2 generation refined the receiver machining and controls. Magpul furniture handles the grip and stock, and the finish is a plain matte black. The lower is where any AR build starts, and starting from a finished one means the only decisions left are barrel length, caliber, and handguard. Controls sit in the familiar places, so anything built on it runs like the rifle the owner already knows. Anyone assembling a 308 class rifle who would rather spend the afternoon shooting than chasing a rolled detent spring across the garage floor will understand the appeal.