By Jeff Gurwitch September 12, 2019 Last updated on 9/12/19. In DefenseReview’s (DR) “The Build” Episode 1: “Franken Race Rifle”, retired Special Forces Soldier and DR writer/contributor Jeff Gurwitch, discusses building a competition-ready AR-15, as well as the benefits of hydraulic buffers and the FERFRANS Delayed Sear Activation System (DSAS)/Rate Reduction System (RRS) bolt carrier group (BCG) in semi-auto and …

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