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Seasonal Promotion: This Weekend Only! Save on Stern Defense — 40 products / 58 models

Treat yourself this weekend by upgrading your firearm with premium parts from Stern Defense. We have special discounts on all in-stock products, including pre-assembled 9mm uppers to kick off your AR-9 build. Grab a new magazine adapter to safely shoot 9mm or 40 S&W ammo from your AR build or accessorize your current AR-9 with drop-in triggers, muzzle devices, and other high-quality gun parts.image

Friday, July 31 12:00 AM – Monday, August 3 12:00 AM CDT -

40 Products in Stern Defense Sale: 3 Days Only!

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Image of Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter (86) List: $179.99 (Save 10%) $161.99 Best Rated
Image of Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver (9) List: $129.99 (Save 10%) $116.99 Best Rated
Image of Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail (4) List: $544.45 (Save 12%) $481.01
Image of Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly Stern Defense SD 6in MOD5 MLOK .45ACP Upper Receiver Assembly List: $570.12 (Save 13%) $495.00
Image of Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver (14) List: $169.99 (Save 10%) $152.99 Best Rated
Image of Stern Defense AR-15 16.1 inch Assembled .45 ACP Upper Receiver w/15 inch MLOK Rail Stern Defense AR-15 16.1 inch Assembled .45 ACP Upper Receiver w/15 inch MLOK Rail List: $603.11 (Save 11%) $533.80
Image of Stern Defense MAG-ADMP9&40/P320 AR-15 M&P 9mm/.40 Magazine Conversion Adapter Stern Defense MAG-ADMP9&40/P320 AR-15 M&P 9mm/.40 Magazine Conversion Adapter (16) List: $186.99 (Save 10%) $168.29
Image of Stern Defense SD 16.1in MOD4 MLOK .40SW Upper Receiver Assembly Stern Defense SD 16.1in MOD4 MLOK .40SW Upper Receiver Assembly List: $614.12 (Save 12%) $540.00
Image of Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver (5) List: $150.65 (Save 10%) $135.59 Best Rated
Image of Stern Defense AR-15 6 inch Assembled 9mm Upper Receiver w/ 8 inch MLOK Rail Stern Defense AR-15 6 inch Assembled 9mm Upper Receiver w/ 8 inch MLOK Rail (5) List: $470.45 (Save 12%) $414.41
Image of Stern Defense MAG-ADB92 AR-15 Beretta 92 9mm Magazine Conversion Adapter Stern Defense MAG-ADB92 AR-15 Beretta 92 9mm Magazine Conversion Adapter (10) List: $186.99 (Save 10%) $168.29 Best Rated
Image of Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter 2 models Stern Defense MAG-ADMP45 AR-15 M&P .45 ACP Magazine Conversion Adapter (13) As Low As (Save Up to 14%) $159.99 Best Rated
Image of Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver Stern Defense SD Mod4 M-Lok 9mm Complete Upper Receiver (5) List: $429.27 (Save 11%) $379.99 Best Rated
Image of Stern Defense SD 8.5in MOD5 MLOK .40SW Upper Receiver Assembly Stern Defense SD 8.5in MOD5 MLOK .40SW Upper Receiver Assembly List: $555.12 (Save 13%) $481.50
Image of Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini Stern Defense RAB-AD Rapid Attach Buttstock Mini Adapter Mini (1) List: $139.99 (Save 10%) $125.99
Image of Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail Stern Defense RAB-AD Rapid Attach Buttstock Adapter for Pic Rail (1) List: $139.99 (Save 10%) $125.99
Image of Stern Defense SD BU40 Bolt Carrier Stern Defense SD BU40 Bolt Carrier (4) List: $142.65 (Save 10%) $128.39
Image of Stern Defense SD AR15 Assembled Upper Receiver Stern Defense SD AR15 Assembled Upper Receiver (2) List: $119.99 (Save 18%) $98.99
Image of Stern Defense MAG-AD FLARE Magazine Well Adapter Stern Defense MAG-AD FLARE Magazine Well Adapter (1) List: $73.00 (Save 10%) $65.70
Image of Stern Defense HS2 Hybrid 2 Stage NiB Drop In Trigger Stern Defense HS2 Hybrid 2 Stage NiB Drop In Trigger (7) List: $167.00 (Save 10%) $150.30 Best Rated
Image of Stern Defense SD CB9 MOD1 Muzzle Device Stern Defense SD CB9 MOD1 Muzzle Device List: $56.99 (Save 10%) $51.29
Image of Stern Defense SD .40SW AR-15 Barrel Threaded 5 models Stern Defense SD .40SW AR-15 Barrel Threaded (3) As Low As (Save Up to 10%) $89.99
Image of Stern Defense 1/2-36 to 1/2-28 thread adapter Muzzle Device Stern Defense 1/2-36 to 1/2-28 thread adapter Muzzle Device (7) List: $27.00 (Save $2.01) $24.99
Image of Stern Defense RAB-AD Mini Male Assembly Stern Defense RAB-AD Mini Male Assembly List: $73.50 (Save 10%) $66.15
Image of Stern Defense SD AR15 Barrel 9 of 10 models Stern Defense SD AR15 Barrel (9) As Low As (Save Up to 10%) $79.99 Best Rated
Image of Stern Defense SD HBC9 Muzzle Device Stern Defense SD HBC9 Muzzle Device List: $36.99 (Save 10%) $33.29
Image of Stern Defense SD RBC45 Muzzle Device Stern Defense SD RBC45 Muzzle Device List: $38.99 (Save $2.00) $36.99
Image of Stern Defense SD MOD4 M-Lok Handguards 4 models Stern Defense SD MOD4 M-Lok Handguards (8) As Low As (Save Up to 10%) $71.99 Best Rated
Image of Stern Defense CB45 MOD1 Muzzle Device Stern Defense CB45 MOD1 Muzzle Device (1) List: $77.99 (Save 23%) $59.99
Image of Stern Defense SD HBC45 Muzzle Device 1 of 2 models Stern Defense SD HBC45 Muzzle Device List: $39.99 (Save 10%) $35.99 Final Sale
Image of Stern Defense 9mm Bolt Replacement Kit for SD BU9 Stern Defense 9mm Bolt Replacement Kit for SD BU9 List: $29.99 (Save $1.00) $28.99
Image of Stern Defense RAB-AD Male Assembly Stern Defense RAB-AD Male Assembly (2) List: $73.50 (Save 10%) $66.15
Image of Stern Defense FH9 MOD1 Muzzle Device 1 of 2 models Stern Defense FH9 MOD1 Muzzle Device List: $44.99 (Save 10%) $40.49 Final Sale
Image of Stern Defense MOD5 M-Lok Handguards 3 models Stern Defense MOD5 M-Lok Handguards (9) As Low As (Save Up to 10%) $79.99
Image of Stern Defense SD FH45 MOD1 Muzzle Device Stern Defense SD FH45 MOD1 Muzzle Device (3) List: $44.99 (Save $3.50) $41.49 Final Sale
Image of Stern Defense SD CB9 MOD2 Muzzle Device Stern Defense SD CB9 MOD2 Muzzle Device (1) List: $56.99 (Save 10%) $51.29
Image of Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail (5) List: $486.45 (Save 12%) $428.81 Best Rated
Image of Stern Defense MAG-AD Ejector Replacement Kit Stern Defense MAG-AD Ejector Replacement Kit List: $21.97 (Save 55%) $9.99
Image of Stern Defense SD RBC9 Muzzle Device Stern Defense SD RBC9 Muzzle Device List: $34.99 (Save $2.00) $32.99
Image of Stern Defense SD CH1 AR-15 Charging Handle Stern Defense SD CH1 AR-15 Charging Handle (1) List: $32.50 $32.49
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    Last updated 2026-07-31 UTC.