NFA C-4 Billet Stripped AR-15 SBR Lower Receiver

Availability: In stock

MSRP: $179.00 Our Price: $169.00 Save 5%

Quick Overview


New Frontier Armory C-4 AR15 Lower Receiver. Machined from aircraft grade Billet Aluminum, not forged and compatible with all standard AR-15 components and magazines.

Machined with enhancements such as: -short throw fire control selector compatibility -captured take down spring (set screw included) -upper receiver tensioning screw -ambi trigger finger rests with grooves -ambidextrous mag release compatibility -threaded bolt catch pin

These are registered with the ATF as 5.56mm caliber w/ 10.5" barrel or 300BLK w/ 9" barrel. Select your choice below.

MSRP: $179.00 Our Price: $169.00 Save 5%
Caliber 5.56mm, 300BLK
Action Semi-Auto; Closed bolt
Barrel No
Length No
Height No
Weight 10.4000
Thread Pitch What thread pitch do I have? Multiple Thread Pitchs Available
Magazine Any Standard MIL-SPEC AR-15
Color Black
Finish Hard Coat Anodized
Materials 7075-T6 aircraft grade billet aluminum
Manufacturer New Frontier Armory (NFA)
Warranty Lifetime warranty against any manufacturer defects when used as directed
Manufacturer's Suggested Retail Price $179.00

NFA C-4 Billet Stripped AR-15 Lower Receiver milled from 7075 T6 aircraft grade aluminum. This lower will accept any upper and/or caliber designed for the AR-15 platform and will accept any standard MIL-SPEC AR-15 magazine. THIS IS A FACTORY REGISTERED SBR LOWER RECEIVER. ALL NFA RULES APPLY.

  • Machined from 7075-T6 aircraft grade billet aluminum
  • Matte black hard-coat anodized per Mil 8625 Type 3 Class 2
  • Precision broached magazine well with beveled feed lips
  • Machined and engraved to be compatible with 45 and 60 degree short throw fire control selectors such as the BAD_ASS ST 45 Lever
  • Caliber marking of "Multi" so it can be used with many different caliber uppers
  • Compatible with all standard AR-15 components and magazines and most aftermarket parts
  • Take down pin spring and detent hole is threaded for a 4-40 set screw for easy capturing (hardware included)
  • Upper tension screw behind grip screw (threaded hole with hardware included) to adjust any “slop” out of vertical fit between upper and lower

Ask a Question

  • Would I still have to get my trust name engraved in the factory registered lower receiver?

    No, this is a factory registered lower receiver and you would not have to engrave your trust information on the receiver.

  • If the receiver is registered with a barrel length of 10.5" can I put an upper shorter than that? Specifically an AR57 6" upper. Thank,Zein

    Yes, you can put any length or caliber upper on a registered SBR lower.