5.56 or 300BLK? - Roundtable Livestream

This review of the CMMG DISSENT Mk4 300BLK highlights its compact design, internal buffer system allowing for firing with a folded brace, and an adjustable gas block for tuning loads and suppressor use. The firearm features a 10.5" barrel, M-LOK and Picatinny rail integration, and a high-quality trigger. The presenter, demonstrating experienced firearm knowledge, emphasizes the attention to detail in its fit and finish and its reliable performance across various ammunition types.

The Palmetto State Armory AXR SSP rifle system, showcased at SHOT Show 2026, features a short-stroke piston for reduced front-end weight and enhanced modularity. Key design elements include a user-serviceable barrel nut for home barrel swaps and compatibility with AR-15 components. Available in 5.56 and .300 Blackout, the AXR offers fully ambidextrous controls and is optimized for suppressor use with an adjustable gas system.

This video explores the potential of the .300 Blackout cartridge as a General Purpose Rifle (GPR) round, capable of effective engagement at distance with optimized subsonic and supersonic loads. Instruction from T.REX ARMS highlights its 'Hollywood quiet' capability with subsonic ammunition and suppressors, originally designed for the PDW role. The discussion emphasizes optimizing the platform for both subsonic and supersonic performance.

The SIG 516 G3 is an updated AR-15 platform rifle, building on the renowned durability of the 516 series with modern enhancements. Key features include a Hybrid Series muzzle device for flash suppression and compensation, a soft-shooting piston system with a 4-position adjustable gas valve, and a cold hammer-forged barrel for extreme durability. The rifle also boasts a full-length M-LOK handguard, ambidextrous controls, and a non-reciprocating side charging handle for improved ergonomics and operational flexibility. SIG Sauer has also incorporated user-replaceable wear components and enhanced safety features, positioning the 2025 model as a highly reliable and future-proofed firearm.

This video showcases the LMT MRP's quick-change barrel system, allowing users to swap calibers like 7.62 and 6.5 Creedmoor in approximately 60 seconds. The 14.5-inch barrel provides M110-level ballistics within an M4-sized platform, highlighting the system's versatility and compact design. The demonstration emphasizes the ease and speed of caliber conversion.

This video showcases the Palmetto State Armory Sabre-18 rifle in .300 Blackout. It highlights the rifle's FDE finish, tactical accessories like Unity Tactical FAST mounts and a red dot optic, and its performance with AAC 220 Gr. Matchking subsonic ammunition. The demonstration emphasizes the platform's low recoil and quiet operation when suppressed, presenting it as a capable tactical build.

This review explores the Franklin Armory BSFIII 22-C1 binary trigger for the Ruger 10/22, demonstrating its unique fire-on-pull-and-release functionality. The video also highlights the use of Aguila Super Extra ammunition and ProMag 35-round magazines. A giveaway for a Nemo Arms Executive Order rifle in 6.5 Creedmoor is also featured, showcasing its premium components.

A retired SEAL Team Six commander details his preferred AR-15 build, emphasizing practical ergonomics and efficient accessory placement. Key choices include an EOTech Vudu LPVO with a top-mounted Aimpoint ACRO for rapid target acquisition, a B5 Systems stock for battery storage, and strategic placement of a vertical foregrip, light, and laser to avoid snags and maintain a clear sight picture. The build prioritizes functionality and speed, even on a budget-friendly base.

This review compares the Glock 17 and Glock 19, highlighting their physical differences, historical context, and practical applications. While the Glock 19 excels in concealed carry due to its smaller size, the Glock 17 offers a longer sight radius and higher capacity. Accuracy tests showed negligible differences for most shooters, with personal preference and hand size being key factors in choosing between them.

This video explores the top five firearm types for home defense, emphasizing personal comfort and training. It covers pistols like the Beretta M9A3 and FN FNX-45 Tactical, highlighting features for close quarters and low-light conditions. Pistol Caliber Carbines (PCCs) such as the CZ Scorpion offer improved accuracy and capacity. The AR-15 platform, exemplified by the Daniel Defense MK18, provides power but requires careful ammunition selection to mitigate over-penetration risks. Finally, shotguns, including the Remington 870 and bullpup models like the Panzer Arms BP-12, are discussed as classic yet effective options.