Strike Industries AR-15/M4 Lower Receiver Spring Kit - Black AR-PlatformStrike Industries$8.95
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Fightlite
Fightlite
The Fightlite Industries SCRLWRP Lower Receiver for AR/M4 is a multi-caliber lower assembly engineered to accept standard AR/M4 uppers, bolts, and firing pins—making it a straightforward path to building a custom rifle without gunsmith intervention. Machined from aerospace-grade 7075-T6 aluminum and finished with MIL-Spec hardcoat anodize, this lower is built to handle demanding field conditions and deliver long-term reliability.
What sets this lower apart is its versatility. Because it accepts any AR/M4 magazine and standard bolt and firing pin components, you can configure it for your choice of caliber and barrel length by simply swapping uppers. The captive push-pin design keeps everything aligned during assembly, and the included bolt catch rounds out the functionality. Whether you're building a precision rifle, a compact setup, or something in between, this lower gives you the flexibility to spec it your way.
Manufactured entirely in the USA from high-strength aerospace alloys, the SCRLWRP reflects Fightlite's commitment to durability and American craftsmanship. The MIL-A-8625F black hardcoat anodize and MIL-Spec manganese phosphate finishes provide robust corrosion resistance—critical if you plan to run suppressed or shoot in wet, muddy, or salt-air environments. This is a lower that works as hard as you do.
| Receiver Type | Multi-Caliber Lower (Accepts AR/M4 Uppers) |
| Material | Aerospace-Grade 7075-T6 Forging |
| Aluminum Finish | MIL-A-8625F Black Hardcoat Anodize |
| Steel Finish | MIL-Spec Manganese Phosphate |
| Grip | High-Impact Synthetic Polymer |
| Bolt Carrier Group | Included; Accepts Standard AR/M4 Bolts and Firing Pins |
| Magazine Compatibility | Accepts Any AR/M4 Magazine |
| Included Components | Bolt Catch |
| Origin | 100% Made in the USA |
The SCRLWRP accepts any standard AR/M4 upper receiver, as well as any AR/M4 bolt and firing pin. This compatibility means you can pair it with barrels and uppers in different calibers to build multiple configurations from one lower.
The lower includes a bolt carrier group and bolt catch. You'll need to source an AR/M4 upper receiver, bolt, and firing pin to complete the assembly. Once you have those components, no gunsmith is required—it's a straightforward build.
The SCRLWRP accepts any standard AR/M4 magazine, giving you broad compatibility with off-the-shelf ammunition feeding solutions.
Yes. The aerospace-grade aluminum construction and dual-finish approach—MIL-Spec hardcoat anodize on aluminum and manganese phosphate on steel—provide excellent corrosion resistance for wet, muddy, and salt-air shooting. The design is suppressor-capable when paired with an appropriately threaded barrel.
The Fightlite Industries SCRLWRP Lower Receiver for AR/M4 is a multi-caliber lower assembly engineered to accept standard AR/M4 uppers, bolts, and firing pins—making it a straightforward path to building a custom rifle without gunsmith intervention. Machined from aerospace-grade 7075-T6 aluminum and finished with MIL-Spec hardcoat anodize, this lower is built to handle demanding field conditions and deliver long-term reliability.
What sets this lower apart is its versatility. Because it accepts any AR/M4 magazine and standard bolt and firing pin components, you can configure it for your choice of caliber and barrel length by simply swapping uppers. The captive push-pin design keeps everything aligned during assembly, and the included bolt catch rounds out the functionality. Whether you're building a precision rifle, a compact setup, or something in between, this lower gives you the flexibility to spec it your way.
Manufactured entirely in the USA from high-strength aerospace alloys, the SCRLWRP reflects Fightlite's commitment to durability and American craftsmanship. The MIL-A-8625F black hardcoat anodize and MIL-Spec manganese phosphate finishes provide robust corrosion resistance—critical if you plan to run suppressed or shoot in wet, muddy, or salt-air environments. This is a lower that works as hard as you do.
| Receiver Type | Multi-Caliber Lower (Accepts AR/M4 Uppers) |
| Material | Aerospace-Grade 7075-T6 Forging |
| Aluminum Finish | MIL-A-8625F Black Hardcoat Anodize |
| Steel Finish | MIL-Spec Manganese Phosphate |
| Grip | High-Impact Synthetic Polymer |
| Bolt Carrier Group | Included; Accepts Standard AR/M4 Bolts and Firing Pins |
| Magazine Compatibility | Accepts Any AR/M4 Magazine |
| Included Components | Bolt Catch |
| Origin | 100% Made in the USA |
The SCRLWRP accepts any standard AR/M4 upper receiver, as well as any AR/M4 bolt and firing pin. This compatibility means you can pair it with barrels and uppers in different calibers to build multiple configurations from one lower.
The lower includes a bolt carrier group and bolt catch. You'll need to source an AR/M4 upper receiver, bolt, and firing pin to complete the assembly. Once you have those components, no gunsmith is required—it's a straightforward build.
The SCRLWRP accepts any standard AR/M4 magazine, giving you broad compatibility with off-the-shelf ammunition feeding solutions.
Yes. The aerospace-grade aluminum construction and dual-finish approach—MIL-Spec hardcoat anodize on aluminum and manganese phosphate on steel—provide excellent corrosion resistance for wet, muddy, and salt-air shooting. The design is suppressor-capable when paired with an appropriately threaded barrel.
