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:The Rotten Apple RideoutHard Skills TrainingPreview - Recoil ManagementRifle Ready: Tripod Buyer's Guide 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). Get your pack of 50 Print-at-Home targets when you subscribe to the RECOIL email newsletter. We'll send you weekly updates on guns, gear, industry news, and special offers from leading manufacturers - your guide to the firearms lifestyle.You want this. Trust Us.