By David Crane david (at) defensereview (dot) com All photo and video content contained in this article was shot by DefenseReview.com, and is copyrighted. DefenseReview.com owns the copyright on all photo and video content. All DR photos and videos were shot with a Sony Cyber-shot RX100 (DSC-RX100/B) Digital Camera with 20.2 MP (20.2-megapixel) still camera and 1080p HD video camera capability. The …

By David Crane david (at) defensereview (dot) com Video(s) Credit: Patriot Ordnance Factory (POF-USA) The following article is property of DefenseReview.com (DR) and is copyrighted material. If you are reading this article on another website other than DefenseReview.com, please email us the website address/URL (where the unauthorized DR article reprint is located) at defrev (at) gmail (dot) com. Thank you. …

By David Crane defrev (at) gmail (dot) com July 27, 2011 DefenseReview first became aware of the TNW SGP-QCB (System Gas Piston-Quick Change Barrel) 5.56x45mm NATO (5.56mm NATO)/.223 Rem. gas piston/op-rod tactical AR carbine/SBR (Short Barreled Rifle) weapons/upper receiver assemblies in December 2009 in a NorthwestFirearms.com forum thread. We subsequently did some additional research on the system in early June …

By David Crane defrev (at) gmail (dot) com April 21, 2011 Updated on 4/21/11. A company called Adcor Defense is manufacturing and marketing a new gas piston/op-rod (operating rod) tactical AR (AR-15) rifle/carbine/SBR (Short Barreled Rifle) called the B.E.A.R. Gas Piston Rifle (GPR). “B.E.A.R.” is an acronym that stands for “Brown Enhanced Automatic Rifle”, since the weapon was designed and …

By David Crane defrev (at) gmail (dot) com May 23 2010 On May 18, 2010, The Firearm Blog reported on yet another company developing yet another gas piston/op-rod AR (AR-15) rifle/carbine/SBR (Short Barreled Rifle) platform. The company is Holland Automatic Rifles (HAR). The piston/op-rod (operating rod) system is a tri-vent/progressive-vent, vectored-exhaust, recoil-attenuating/mitigating system that, according to “John” at HAR, requires …

By David Crane defrev (at) gmail (dot) com All photos contained in this article were taken by DefenseReview.com, and are copyrighted. DefenseReview.com owns the copyright on these photos. The photos were shot with a Canon PowerShot S90 10-megapixel digital camera (still camera with video capability). April 15, 2010 A company called Grauer Systems showed an interesting AR-15 rifle/carbine accessory called …

By David Crane defrev (at) gmail (dot) com August 26, 2009 Back on June 7, 2009, DefenseReview published a heads-up piece on the new Ruger SR-556 gas piston/op-rod AR-15 tactical carbine. In that piece I wrote this: “One of the things were going to investigate is whether or not the SR556 is completely debugged, or whether it has the normal/usual …

By David Crane defrev (at) gmail (dot) com Photo Credits: Sturm Ruger & Co., Inc. June 7, 2009 Updated on 6/16/09 Ever since the late

By David Crane defrev (at) gmail (dot) com Photo(s) Credit: Doug Richardson, Special Weapons for Military & Police (SWMP) May 13, 2009 Updated on 5/15/09 And, speaking of Charlie Cutshaw articles, we might as well mention Mr. Cutshaw’s cover gun article on the Vltor/POF 6.5 Grendel (a.k.a. 6.5mm Grendel a.k.a. 6.5G a.k.a. 65G) semi-auto-only direct-gas-impingement (DGI) AR-15 tactical carbine/rifle for …

By David Crane defrev at gmail dot com All photographic images contained in this article were taken by DefenseReview.com, and are the exclusive property of DefenseReview.com. DefenseReview.com owns the copyright on these photos. All photos were shot with an Olympus Stylus 790 SW 7.1-megapixel digital camera, which is advertised as "shock + waterproof". January 22, 2009 While DefenseReview was at …