Superior Defense SD13 Tank Lowers Stripped AR-15 Lower Receiver, 5.56mm NATO, Black Type III Hard-Coat Anodized, Factory Engraved Tank Graphic (Like-New)
This is a LIKE NEW stripped AR-pattern lower receiver by Superior Defense from the SD13 "Tank Lowers" series, marked "5.56MM" and "SD13." It features factory engraving including a tank outline graphic on the left-side magwell and detailed receiver markings identifying Superior Defense in Las Vegas, NV. This run is described by Superior Defense as the last run of black stripped lowers sold with Superior Defense branding as "TANK LOWERS," offered via a preorder window in early May 2025.
CONDITION
Overall Condition: Like-New
Bore Condition: Not applicable (stripped lower receiver; no barrel/bore present).
Finish Condition: Like-New
Mechanical Condition: Like-New
Cosmetic Condition: Like-New
Specific Condition Notes: This lower receiver is described as like new. It is a stripped AR-pattern lower receiver with no trigger group, pistol grip, receiver extension/buffer tube, stock, magazine catch, bolt catch, or takedown/pivot pins installed or visible.
WHAT'S INCLUDED
- Factory cardboard box with S/N label (SD13000903)
- Clear bag of screws/small parts (includes a set screw with green pre-applied patch and an additional small pin/screw-like part)
Built on a forged 7075-T651 aluminum receiver with a black Type III hard-coat anodized finish, this SD13 lower keeps the look clean while still being visually distinct. The left-side magwell tank outline graphic and crisp engraved markings give it a recognizable "Tank Lowers" identity without adding anything that does not belong on a stripped receiver.
The receiver markings are engraved "SUPERIOR DEFENSE / LAS VEGAS, NV / USA / 5.56MM / SD13," with selector markings engraved "SAFE / FIRE / AUTO." The selector markings are markings only; fire-control capability is not determined from photos.
This is an AR-15 platform lower with female AR-pattern buffer tube threads visible at the rear. The serial "SD13000903" is engraved on the receiver, and the serial number matches the box label, providing clear label-to-receiver consistency for this specific item.
Superior Defense release information for this SD13 run states the lowers were made by ZEV Technologies. Combined with the limited-edition context described for the early May 2025 preorder window and the "last run" note for black "TANK LOWERS" branding, this example is a clearly documented release within the SD13 Tank Lowers series.