Guns [Watch] RECOILtv Gun Room: SureFire OBC RECOILtv March 6, 2018 Join the Conversation RECOIL TV GUN ROOM: SUREFIRE OBC SureFire‘s new Optimized Bolt Carrier group is a drop-in reliability upgrade for any AR-15 pattern rifle. Jim Sullivan, the guy who made Eugene Stoner’s gas system work in the AR-15, applied decades of hindsight to the BCG to develop the concept for the OBC … which SureFire now brings to reality. There’s quite a bit going on here, and this video Barry Dueck goes in-depth. Here’s the big blue arrows description: The system uses new bolt carrier geometry, a rebounding counterweight and redesigned gas key, a shorter buffer, a new buffer spring, and some other voodoo to slow the BCG and increase the time the system has to strip and load the next round. Aside from improved reliability, the OBC reduces wear and increases the service life of the host rifle. It also increases controllability of full-auto ARs by smoothing and slowing the rate of fire by about 30 percent. Gun Room is Presented to You By: Kimber Want to see more from RECOILtv? WATCH NOW! Explore RECOILweb:AfterSHOT: Emerson HMMV-K - MidTech KnifeOFFGRID is at OR Winter MarketU.S. Army Awards Second Source Contract to Winchester for $8.1 Million Worth of 7.62 AmmunitionRed Bloods NEXT STEP: Download Your Free Target Pack from RECOILFor years, RECOIL magazine has treated its readers to a full-size (sometimes full color!) shooting target tucked into each big issue. Now we've compiled over 50 of our most popular targets into this one digital PDF download. From handgun drills to AR-15 practice, these 50+ targets have you covered. Print off as many as you like (ammo not included). Click here to get IMMEDIATE ACCESS to a digital PDF of this target pack!