Sons of Liberty Gun Works (SOLGW) Castle Nut – Class 3A Threads – SOLGW-CASTLENUT
The Sons of Liberty Gun Works Castle Nut (SOLGW-CASTLENUT) is a 2026-spec essential component for builders who understand that a rifle is only as reliable as its smallest parts. Unlike standard commercial-grade nuts, this component is precision-machined from 17-4 Stainless Steel and treated with a durable black Nitride finish for maximum corrosion resistance and longevity. The hallmark of this castle nut is its Class 3A thread specification, providing the tightest possible tolerances and maximum thread engagement with your receiver extension (buffer tube). This ensures a "rock-solid" connection that is significantly less likely to back out under the high-vibration environment of semi-automatic fire.
Designed for professional armoring, the SOLGW Castle Nut (657628674443) features six deep staking notches, offering more material displacement area than a standard four-notch nut. This allows for a deeper, more secure stake with an automatic center punch, ensuring the nut remains permanently indexed until you intentionally choose to remove it. Furthermore, the nut is slightly extended in length compared to basic Mil-Spec versions, providing additional structural support at the critical junction where the receiver extension meets the lower receiver—a known potential failure point in hard-use rifles. Whether you are building a duty rifle or a precision carbine, the SOLGW castle nut is a small investment in long-term structural security.
Includes: (1) SOLGW 17-4 Stainless Steel Nitride Castle Nut.
Key Features
- Class 3A Thread Precision: High-tolerance threads provide superior engagement and security compared to standard Class 2A commercial nuts.
- 17-4 Stainless Steel Construction: Offers exceptional strength and resistance to the "rounding off" common in lower-grade steel nuts.
- 6 Deep Staking Notches: Optimized for professional-grade staking, ensuring maximum material displacement and a permanent mechanical lock.
- Black Nitride Finish: Provides a hard, slick surface that resists rust, carbon buildup, and environmental wear.
- Extended Length Profile: Adds material strength to the buffer tube junction, reinforcing a potential weak spot on AR-15 platforms.
- Ground Flat Face: The mounting face is ground perfectly flat to ensure maximum surface contact with the end plate for a true, square fit.
Product Specifications
- Brand: Sons of Liberty Gun Works (SOLGW)
- Model: MK1 Extended Castle Nut
- SKU: SOLGW-CASTLENUT
- Material: 17-4 Stainless Steel
- Thread Spec: Class 3A
- Finish: Black Nitride
- Notches: 6 Deep Staking Recesses
- Weight: 0.10 lbs
- UPC: 657628674443
