The Ruger SFAR Showdown | 6.5 vs .308

Introductions and Ruger SFAR Overview

The hosts open by introducing a new Ruger SFAR and thanking Classic Firearms viewers for supporting the channel. They explain that the SFAR is a small-frame AR-10 platform chambered in .308 Winchester and 6.5 Creedmoor. Despite being an AR-10, the rifle feels closer in size and weight to an AR-15 due to its slim profile and lightweight design. Ruger’s goal is to offer an affordable AR-10 with multiple caliber options at a price point around $1,049, comparable to many standard AR-15s. The hosts plan to put both calibers through live-fire testing to evaluate how the rifles handle and perform under realistic conditions.

Caliber Comparison: 6.5 Creedmoor vs .308

The discussion shifts to the differences between 6.5 Creedmoor and .308 Winchester. The casings are similar in length, but the 6.5 Creedmoor case is slightly fatter, and its projectile is taller and slimmer. The hosts describe 6.5 Creedmoor as a hotter, more efficient round with better ballistic coefficients, noting that in previous bolt-gun precision series, 6.5 Creedmoor consistently outperformed .308 when using match-grade ammunition. They emphasize that this does not make .308 inferior; .308 remains widely available, generally cheaper, and offers strong terminal performance and reach. It is still commonly used by snipers and in many practical applications, so both calibers have clear roles depending on shooter needs and distance.

Ruger SFAR Features and Configuration Options

The Ruger SFAR is offered with 16-inch and 20-inch barrels, with 16 inches available only in .308 and 20 inches available in both .308 and 6.5 Creedmoor. The rifle includes a Ruger muzzle device and a very slim M-LOK rail that allows a full hand wrap despite the AR-10 receiver size, giving it an AR-15-like feel. Controls are familiar AR-style, with a slightly flared magwell area and standard AR ergonomics. The hosts note the use of Magpul PMAG furniture and a mil-spec trigger. One criticism is the lack of an ambidextrous safety, which they would prefer for long-range shooting and off-side manipulation, though they acknowledge this likely helps keep the price down and can be upgraded aftermarket. The SFAR uses a direct-impingement system with a four-position adjustable gas block, including a zero setting that fully blocks gas for bolt-gun-style operation, especially useful for long-range or suppressed use.

Initial Live-Fire with 6.5 Creedmoor SFAR

The hosts begin live-fire testing with the 6.5 Creedmoor Ruger SFAR, equipped with an EOTech 1–8x optic. They start with regular brass 6.5 Creedmoor ammunition to get a feel for recoil and overall handling before moving to match-grade loads at 100 yards. Recoil is described as milder than expected, with the rifle shooting flat and remaining controllable. The rifle runs reliably, but the ejection pattern suggests the gas setting may be on the high side. They note visible gas and smoke, and mention that the gun is brand new and still burning off manufacturing residue, so some break-in is expected. This initial session is focused on establishing baseline feel and function before fine-tuning the gas system and conducting formal accuracy testing with match-grade 6.5 Creedmoor and .308 ammunition.

Adjusting the Ruger SFAR Gas Block

After observing the 6.5 Creedmoor SFAR’s ejection pattern, the hosts decide to adjust the four-position gas block. Using the included adjustment tool, they move from setting three down to two to reduce gas and improve ejection behavior. At the lower setting, they experience insufficient gas, with weak extraction and cases barely clearing the ejection port, indicating the rifle is under-gassed. They return the gas block to setting three, the most open position, to restore reliable cycling. The hosts emphasize the importance of having enough gas for consistent ejection, especially as the rifle gets dirty and carbon builds up, which can otherwise lead to stovepipes or other malfunctions. They highlight that the adjustable gas system is a key feature, allowing tuning for different ammunition types and conditions, but it must be set high enough to maintain reliability.

Testing the .308 SFAR and Ejection Pattern

The focus moves to the .308 Ruger SFAR, also topped with an EOTech 1–8x optic and loaded with brass-cased .308 ammunition. Starting at gas setting three, the hosts note that .308 should generally run more reliably in a semi-automatic platform than 6.5 Creedmoor. During rapid fire, the .308 SFAR shows a strong, consistent ejection pattern at an ideal angle, clearly better than what was seen earlier with the 6.5 Creedmoor at lower gas settings. The rifle remains flat-shooting and controllable, and the hosts comment that they could hear consistent hits while maintaining a steady cadence. They point out that the .308’s ejection behavior at the same gas setting demonstrates how caliber and ammunition choice interact with the SFAR’s adjustable gas system, reinforcing the need to tune each setup for optimal reliability and performance.