What Happens If You Chamber 300 AAC In a 556 Upper

This video demonstrates the operation and live fire of the Colt AR-15A4 rifle. It covers essential steps from safe weapon handling and magazine loading to chambering a round and engaging a steel silhouette target. The presenter emphasizes proper technique, including controlled trigger pulls and observing the rifle's cycling action, showcasing the firearm's functionality in a focused, demonstrative manner.

This video provides expert guidance on stockpiling ammunition, emphasizing pattern recognition of market shortages rather than panic buying. It details seven calibers that consistently become scarce, offering specific recommendations for reserve quantities for each, distinguishing between training and defensive loads. The advice is presented from the perspective of a firearms instructor focused on practical preparedness.

This video from Line45, hosted by Ted, outlines seven critical ammunition calibers Americans should stockpile to prepare for potential ammo shortages, referencing patterns seen in 2020 and anticipating a 2026 crunch. Ted emphasizes the importance of having sufficient defensive and training ammunition for various firearms, detailing why specific calibers disappear first during panic buying and the factors influencing supply chain disruptions. The advice is geared towards intermediate shooters and gun owners concerned with preparedness.

This video tests the penetration capabilities of various calibers against a boulder, culminating with the .50 BMG. While smaller calibers like .22 LR, 9mm, and .45 ACP caused minimal damage, larger rounds like 5.56mm and 12 gauge slugs began to chip the rock. The .308 and initial .50 BMG shots caused significant fragmentation but did not penetrate. A second .50 BMG shot successfully penetrated the boulder.

This gel block test compares the terminal ballistics of 5.56x45mm NATO M855 Green Tip and 7.62x39mm Tula ammunition. The 5.56mm round demonstrated significant expansion and tumbling, while the 7.62x39mm round showed similar width expansion but greater length and penetration. The test highlights the distinct terminal effects of these common rifle calibers.

This video analyzes the cost-effectiveness of reloading ammunition in 2026, focusing on common calibers like 9mm and .223/5.56, as well as larger calibers like .300 Win Mag. It highlights that while reloading can offer savings, the initial cost of equipment and the current high price of brass, often imported from India and China, significantly impact the break-even point. The analysis suggests that reloading is most beneficial for those with a long-term shooting plan, typically breaking even after three years for common calibers and two years for larger ones, assuming brass is reused.

This video provides a silent, cinematic demonstration of a custom MK18-style AR-15 build, showcasing high-end tactical accessories. It highlights the integration of professional-grade components like the Unity Tactical FAST riser system for optics, a JK Armament suppressor, and a Cloud Defensive Rein weapon light, emphasizing proper setup and advanced configurations. The build features a Daniel Defense RIS II rail and an Aero Precision lower with a Law Tactical folding stock adapter, demonstrating a meticulous approach to firearm customization.

This entry details a visual showcase of a Zastava ZPAP M70 AK-47 modified into a bullpup configuration. The firearm features a custom chassis with a carry handle and optics rail, demonstrating a unique approach to the AK platform. The demonstration highlights the rear-mounted magazine and trigger linkage typical of bullpup designs.

This guide details a durability test comparing a $70 Amazon ACOG clone against a $1300 Trijicon ACOG. The test involves baseline accuracy firing, impact resistance testing, and a submersion test in a river to evaluate waterproofing. The results highlight significant differences in build quality and resilience between the budget and premium optics.

This review from Tactical Advisor provides an expert look at the Palmetto State Armory (PSA) Sabre rifle, highlighting its impressive value at a $900 price point. The rifle comes with significant factory upgrades, including an enhanced trigger and controls, a 13.7-inch pinned and welded barrel, and an adjustable gas block for performance tuning. The assessment suggests it's a strong contender for the best budget rifle on the market.