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The Lantac SF15 USR is a no-compromise receiver set built on a foundation of 7075-T6 forged aluminum, precision machined and finished with Type 3 hardcoat anodizing in deep black. This matched pair delivers measurably better tolerances than standard mil-spec, giving you the kind of tight receiver lockup that makes a real difference on the range.
The upper receiver starts with a raised pad behind the front lug that facilities a noticeably tighter fit with the lower. The barrel extension bore is deliberately undersized compared to mil-spec, which promotes a much tighter barrel fit and translates directly to improved accuracy. What really sets this upper apart is the machining process: the bore, threads, Picatinny rail, and front receiver face are all cut in a single operation. This means you get the kind of concentricity and perpendicularity that loose tolerances simply can't match. The upper ships with both a dust cover and forward assist, and the single-piece Picatinny rail accepts any standard optics or accessories you want to mount.
The lower is where you'll notice build-friendly details. The magwell is internally flared, which matters if you're running fast magazine changes during training or competition. You also get a spot face cut in the takedown pin area that makes removing the rear pin significantly easier without needing an extended pin. The receiver is finished in the same deep black anodize as the upper, and it accepts all standard AR-15 components and accessories. A tension screw is included for a snug fit between the upper and lower.
This set was designed for builders who care about precision fit and reliability without the billet price tag. The forged construction keeps weight reasonable while maintaining the kind of strength you need for any caliber conversion the AR platform supports. It works equally well as the foundation for a dedicated range rifle, a competition build, or a quality general-purpose setup.
Yes, the LA-SF15 lower is fully compatible with any standard AR-15 upper receiver and supports .223 Remington, 5.56 NATO, .300 Blackout, and other multi-caliber builds. The receivers are manufactured to true mil-spec dimensions in this regard.
The USR design includes a raised pad behind the front lug that creates a tighter receiver fit, and the barrel extension bore is deliberately undersized for much tighter barrel seating. All critical dimensions are machined in one operation for superior concentricity, which improves accuracy and consistency.
No, this is a stripped receiver set. It includes only the upper and lower receivers, dust cover, forward assist, and tension screw. You'll need to source your own fire control group, springs, and other internal components.
Lantac's precision machining produces a noticeably tighter lock between the upper and lower with zero wobble. The USR upper's undersized barrel extension bore and raised lug pad mean barrel fit is significantly more precise than standard receivers, which translates to improved accuracy potential.
The SF15 is designed with precision in mind. The tight receiver lockup, undersized barrel extension, and single-operation machining of critical surfaces make this an excellent foundation for a range rifle or competition build where accuracy matters.
Yes. The LA-SF15 lower works with any AR pistol upper as long as you use appropriate components (like a pistol-length buffer tube and spring). The receivers themselves are not inherently restricted to rifle or pistol configurations.
| UPC | 784672911078 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | LA00302 |
| Shipping Weight | 1.4 |
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