There were no malfunctions of any type of ammunition in either semi-auto only or fully automatic fire. The CQB model offers 30-second barrel swapping capabilities & LMT's rock-solid mono rail. The 300 Blackout, since its SAMMI acceptance, has boomed well beyond calibers such as the 6.8SPC and 6.5 Grendel. That year, then-Staff Sgt. Smaller bullets, down to 125-grain, moved much faster for those not seeking optimal sound moderation. This is the key to the reliable feeding of the 300 Blackout. In November of 1992, he trademarked the name. The second was making high quality but low cost ammunition widely available – which we did with the Remington 115 grain UMC – and without compromise as it actually has premium features such as brass with NATO-like hardness, water proof primers, and a bullet constructed as an open-tip match – but with the nose struck closed to uniform the ballistic coefficient. Not to let their fans out of uniform down, the company’s FN-15 Tactical is offered in .300 BLK complete with the same combat trigger, cold-hammer-forged chrome-lined barrel, snappy trigger pull and rail system as on their military schedule rifles. The UMC ammunition sells for $11.99 a box making this caliber very reasonably priced for the shooters, as opposed to some of the other calibers that start at $22 and go up from there. As received from DS Arms, this 300 Blackout upper receiver assembly did not come with a bolt carrier group or charging handle. T/C uses a 1-in-10 twist, which is not good for sub-sonic with heavy bullets. It should be noted that in 1993, the ATF only logged 310 Form 1s to produce NFA-registered devices such as suppressors. For home defense, the same thing can be said in a .300-chambered AR replacing pistol caliber carbines. Certainly the 300 Blackout was easier to shoot than an AK47/AKM firing the nearly identical cartridge. The first M16/M4 rifle to properly be adapted to the 7.62x39mm caliber cartridge was manufactured in small numbers for a special operations requirement: this is known as the SR-47. The company offers the mid-range CQB KMR-A and MCR carbine varieties, differing in the style of their handguards and gas systems. There are several manufacturers of rifles as well as ammunition. 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As such, few manufacturers chambered rifles for .300 Whisper such as the short-lived Loki Fenrir– although Smith & Wesson did produce a short run of M&P-15s chambered for the cartridge. We were able to do this by designing the guns and ammunition as a team between Remington, Barnes, and AAC – and other makers are following suit, so there are a wide range of choices.”. The sample rifle has been tested with GI aluminum magazines, H&K high reliability mags, Lancer AWM and Magpul PMags. The military made this a requirement – as one does not want to be caught on the incorrect gas block setting and have a malfunction, or be forced to switch settings on the fly. Florida-based Diamondback is a budget AR maker that doesn’t disappoint and has been in the .300 Blackout game since 2014 with their DB15 series rifles. The .300 Whisper, however, barely moved the needle with major gun companies in the 1990s, remaining largely in the territory of aftermarket custom barrel and AR upper makers. Best yet, other than Magpul hardware and mags, they produce just about everything in-house with excellent quality control, which is an outstanding deal when you consider you can usually get into one of these for about $800. The barrel is marked for both the 300 Whisper and 300 Blackout. Sort of like not firing a 5.56mm cartridge in a .223 Rem chamber. It should be noted that. The third was that we cracked the code for making the rifles and ammunition reliable without requiring an adjustable gas block. There have been unconfirmed rumors that testing the .300 AAC Blackout in … As of this writing the only calibers other than 5.56mm in this platform that are easily available and reasonably priced are the 6.8mm Rem SPC and the 300 Blackout – and 6.8mm Rem SPC is on average 40% more expensive than 300 Blackout. While the IMP was a miss, the .221 Fireball became a favorite with wildcat cartridge makers, wizened hand loaders who stretch the envelope of what is commercially available. American Firearms is reader-supported. Robert Silvers of suppressor maker Advanced Armament Company– a brilliant outfit that yielded some of the most important development in quiet time and eventually spun off the legendary John Hollister who went on to form Sig Sauer’s suppressor division– in a 2012 interview confirmed that AAC’s in-house development of the .300 Blackout began in 2009 as a result of a very specific requirement for an unnamed client that was seeking a .30 caliber AR-style platform that was reliable and suppressor-ready. During research for this article, JD Jones was interviewed to get the backdrop on the development of the 300 Whisper: “I first licensed Thompson Center (T/C) to use it and they put it into the Contender and it became quite popular in the Handgun Metallic Silhouette competition for years. The first came from the originator of the 300 Blackout cartridge as we know it, AAC as a complete upper receiver. This is probably the lowest price out there for an upper in this chambering. Hard to beat. AAC and Remington were undoubtedly able to give the cartridge the boost to make it recognized around the world and in this industry as the first real competitor to the 5.56mm in this weapons platform. In a non-adjustable gas system the port pressure of the HV load would be quite high giving excessive bolt velocity with a single non-adjustable system if the sub-sonic was to function reliably. Reed Knight fixed that on his SR47 when he adapted the rifle to the AK47 magazine. Increasingly popular in the past 20 years, pistol caliber carbines or PCCs offer a lot of benefits to the, What is the best 6.5 Creedmoor rifle? Tennessee-based Barrett continues to innovate & impress with their REC7 rifles. Besides standard 5.56 NATO variants, Barret also markets the rifle in 6.8 SPC and .300 BLK format with options for either 16- or 18-inch barrels and ALG triggers. No charging handle or bolt carrier group comes included with the unit, so an LMT enhanced bolt and carrier were used, along with an LMT Tactical charging handle. Shown from left to right are the 5.56x45mm M855A1, 6.8mm Rem SPC, 7.62x39mm and the .300 AAC Blackout cartridges. In the end, while the .300 AAC Blackout is still considered to be a young round when compared to legendary offerings that have been on the market for a half-century or more, it isn’t going away anytime soon and is set to become a classic in its own right, especially as black rifles have become widespread. Another 300 Blackout advantage is flawless functionality with a wide variety of … The last rifle tested was the Lewis Machine & Tool LM8 MRP CQB. The barrel for the MRP CQB chambered in 300 Blackout is interesting in its configuration. Wisconsin-based Bravo Company has grown to become a household name in the AR game and their CQB series guns are crowd-pleasers with consumers seeking a 300 BLK rifle around the $1K-ish price tag that delivers above its weight class. Test ammunition provided for this test consisted of Remington loads including the UMC 115 CTFB, 125 grain OTM, 125 grain Accutip and the 220 grain OTM (subsonic). The Whisper earned its name due to the fact it was specifically designed to perform well in suppressed platforms. This rifle never went into production though Rock River Arms recently introduced the LAR-47 which is a M4 with receivers modified to accept the AK47 magazine. The upper receiver comes with a carbine length direct-impingement gas system and a Knight’s Armament Mid-Length URX forearm grip/quad rail. This is in a nutshell why this cartridge cannot feed reliably in a magazine designed for an AR-15/M16/M4 magazine well. Both 6.8mm Rem SPC and 300 Blackout have full lines by Remington including inexpensive UMC target ammunition. The 300 Blackout duplicates if not slightly improve upon the 7.62x39mm cartridge. Copyright © 2020 American Firearms LLC. This holds true for both suppressed and unsuppressed .300 platforms. For many years weapons manufacturers in the AR business wanted to chamber their rifles in the 7.62x39mm caliber. Using the 7.62x35mm .300 BLK, a modified AR platform firing it had easily suppressed ammunition that produced more energy than the 7.62x39mm — the same round used by the AK-47 around the world– and remained extremely effective even from very short barrels.