Testing PMC X-Tac M855: 8 Chrome-Lined Barrels, 30-Shot Groups

This expert-level review of the Colt 6520 16" pencil barrel provides detailed technical analysis and performance data. The barrel, dated September 2003, features a chrome-lined bore, 1:7 twist, and hand-finished feed ramps. Testing with various ammunition types at 100 yards reveals its accuracy potential, with a 30-shot group of 2.123 MOA using Federal 77gr MatchKing and 3.449 MOA with PMC M855. The review also explores the impact of barrel nut torque on accuracy.

Elliott Delp, an established firearms reviewer, presents an analytical and data-driven review of the American Defense Manufacturing (ADM) UIC AR-15 in 5.56 NATO. The review focuses on accuracy, utilizing Ballistic-X software for precise measurements. Delp compares the ADM UIC against other high-end AR-15s, highlighting its performance metrics.

Elliott Delp of LWRC International presents an LWRC AR-15 (IC-DI) that failed to meet accuracy expectations in a high-end test, achieving a best group of 2.07 MOA and an average of 2.57 MOA. This performance is considered subpar for a $2,000 rifle, especially when compared to other high-end firearms tested. Delp notes this is consistent with previous observations and seeks community input on brand performance.

Elliott Delp conducted an accuracy test on five high-end AR-15 rifles, controlling variables like shooter, barrel length, and range conditions. The American Defense ADM UIC emerged as the top performer with a best group of 0.69 MOA, while the LWRC IC was the least accurate, achieving a best group of 2.07 MOA. This expert-driven analysis highlights significant performance differences between premium AR-15 platforms.

This review of the Green Mountain 12.7" AR-15 barrel highlights its lightweight profile and budget-friendly nature, suitable for general use. While the barrel exhibits minimum spec chamber and throat dimensions, its performance is significantly hampered by an oversized gas port, leading to an overgassed system and poor shooting experience. Accuracy varied considerably with different ammunition types, with match-grade loads performing better than M193.

This expert-level review by Preston Moore details a comprehensive test of the LMT 12.5" Direct Impingement barrel. The analysis includes a thorough borescope inspection revealing minor imperfections in the chrome lining and throat, alongside detailed ballistic testing with three different ammunition types. The data provides valuable insights into the barrel's accuracy, velocity, and overall performance compared to other models.

This extensive 15,000-round test reveals the surprising longevity of a Criterion CORE series AR-15 barrel. Despite significant internal wear, including fire cracking and erosion, the barrel maintained respectable accuracy, particularly with 77gr handloads. The test highlights how barrel degradation impacts ammunition sensitivity and emphasizes the importance of rigorous testing methodologies.

This YouTube video thoroughly tests the accuracy of a Ballistic Advantage AR-15 barrel, specifically evaluating if it lives up to its Sub-MOA guarantee. The creator shoots 30-shot groups with four different types of ammunition, analyzing the results to see if they meet the manufacturer's criteria. The video includes a detailed look at the barrel's specifications, a borescope inspection, the range setup, and a comparison of different ammunition performance, concluding with an overall results analysis and leaderboard. The central question is whether the barrel performs as expected for a Sub-MOA rated component.

This video offers an in-depth analysis and accuracy test of the 16-inch Sons of Liberty Gun Works SPR Barrel. It covers the barrel's unique features like its .223 Wylde chamber, 1:7 twist rate, 3-groove polygonal rifling, and 5/8x24 threads. The review includes a borescope inspection of the internal quality, micrometer measurements of external dimensions, and a detailed shooting assessment with three 30-shot groups using different ammunition types (PMC Bronze 55gr, Hornady 73gr ELD Match, Berger 77gr OTM). The analysis focuses on mean radius, group size, velocity, standard deviation, and shooter-induced flyers. A new metric, A-ZED (A-Zone Equivalence Distance), is introduced to practically assess rifle performance at range. The video provides data-driven insights into the barrel's precision and performance.

This video features a head-to-head comparison of two BCM BFH ELW (Enhanced Lightweight) AR-15 barrels. The creator conducts thorough inspections, including borescoping and headspace checks, revealing some unexpected findings. The testing involves shooting 30-shot groups at 100 yards with three different ammunition types: Winchester 55gr M193 FMJ, Frontier 68gr BTHP, and Federal Gold Medal 77gr SMK. Data is collected using a Garmin Zero C1 Pro chronograph and a Mantis X10 Elite, with results analyzed using mean radius and a custom A-ZED scoring system. The video aims to determine the consistency and real-world accuracy of these specific barrel models and whether any bore anomalies correlate with performance.