Description

Springfield Saint 5.56mm Semi-Automatic AR-15 Rifle with M-Lok Rail

Overview

The Springfield Saint 5.56mm semi-automatic AR-15 rifle with M-Lok rail represents a direct evolution of the modern sporting rifle platform, engineered by Springfield Armory for reliable performance across training, competition, and defensive applications. This rifle integrates a free-float M-Lok handguard system with a mid-length gas system, reducing felt recoil and improving balance over carbine-length configurations. Chambered in 5.56mm NATO, the Saint platform utilizes a forged 7075 T6 aluminum upper and lower receiver set, paired with a 16-inch chrome-moly vanadium steel barrel finished with a Melonite QPQ coating for corrosion resistance and extended service life. The rifle ships with one 30-round Magpul PMAG magazine and a padded nylon sling.

Features & Specs

The Springfield Saint 5.56mm semi-automatic AR-15 rifle with M-Lok rail is built around a mid-length gas system, which reduces bolt carrier velocity and lowers cyclic rate for smoother operation compared to carbine-length systems. The barrel is chrome-moly vanadium steel with a 1:8 twist rate, optimized for stabilizing both 55-grain and 62-grain projectiles. The free-float M-Lok handguard provides continuous Picatinny top rail for optics mounting and allows accessory attachment at the 3, 6, and 9 o clock positions without interfering with barrel harmonics.

• Caliber: 5.56mm NATO (.223 Remington compatible), 16-inch barrel with Melonite QPQ finish, 1:8 twist rate
• Receiver set: Forged 7075 T6 aluminum, Type III hard coat anodized, T-marked upper receiver
• Trigger: Nickel-boron coated single-stage trigger, 5.5 to 6.5 pound pull weight
• Handguard: Free-float M-Lok aluminum rail, 12.5 inches, continuous top Picatinny rail
• Stock: B5 Systems Bravo stock with QD sling mount, H2 buffer, and flat-wire recoil spring
• Weight: 6 pounds 11 ounces unloaded, overall length 32.5 to 35.75 inches (stock collapsed/extended)
• Sights: None included, flat-top receiver with removable carry handle rail section

Additional manufacturer-specified components include a Carpenter 158 steel bolt carrier group with shot-peened bolt and extractor, a pinned low-profile gas block, and a 5/8×24 muzzle thread pattern with a standard A2 flash hider. The magazine well features a flared opening for rapid reloads, and the bolt release is oversized for gloved operation.

Who It Is For

This Springfield Saint 5.56mm semi-automatic AR-15 rifle with M-Lok rail is suited for shooters requiring a mid-tier duty-grade rifle without custom assembly. It serves law enforcement patrol officers, civilian defensive shooters, and practical rifle competitors who need a factory-built platform with consistent reliability. The mid-length gas system and free-float rail appeal to shooters who prioritize accuracy potential and reduced sight movement during rapid fire. The 1:8 twist barrel is a practical compromise for those who shoot both standard M193 ball ammunition and heavier match-grade loads. This rifle is not optimized for benchrest precision shooting or lightweight ultralight carry, but fills the role of a general-purpose modern sporting rifle with verified performance from Springfield Armory.

• Law enforcement and security personnel requiring a department-issue or personally owned duty rifle
• Civilian shooters seeking a factory-assembled AR-15 with mid-length gas system and free-float handguard
• Rifle competitors in divisions allowing standard AR-15 pattern rifles with M-Lok accessory mounting

• Home defense users who prioritize reliability over custom lightweight builds
• Newer AR-15 owners wanting a complete rifle with no assembly required
• Shooters transitioning from carbine-length to mid-length gas systems for reduced recoil impulse

Shipping & FFL

This Springfield Saint 5.56mm semi-automatic AR-15 rifle with M-Lok rail will ship to a federally licensed firearms dealer (FFL) in your state of residence. After placing your order, you must provide the name and contact information of your chosen FFL holder. We will ship only to FFLs that have a current signed license on file with us. It is your responsibility to verify that this rifle is legal to possess in your jurisdiction, including compliance with any state or local restrictions on magazine capacity, barrel length, or features. All applicable federal, state, and local laws apply. Please confirm your FFLs acceptance of online transfers before completing your purchase. Allow 3-7 business days for processing and shipment. The buyer must be at least 18 years of age for long gun purchases and must pass a NICS background check at the time of transfer. No shipments will be made to PO boxes or APO addresses for firearms. The rifle ships in a locked hard case with one 30-round magazine, sling, and operator manual.