“Rucksack” Compact 9mm 8.3″ AR-9 Pistol Kit – Team Dream Build
Features
- Compact 9mm AR pistol kit based on AT3’s AR-9 builder video series
- 8.3″ AT3 9mm barrel keeps the build compact while offering more velocity than shorter PCC barrel options
- Angstadt Arms 0940 receiver set accepts Glock-pattern 9mm magazines and gives the build a dedicated AR-9 foundation
- STNGR HWK 7″ M-LOK handguard provides a lightweight front end with enough space for a light and support-hand placement
- AT3 9mm bolt carrier group supports direct blowback AR-9 operation
- Armaspec Stealth Recoil Spring gives the pistol a captured recoil system for a smoother, quieter shooting feel
- Geissele G2S trigger provides a deliberate two-stage trigger setup for a compact defensive-style PCC
- AT3 ALPHA green dot, Streamlight weapon light, and Magpul MS4 sling complete the practical close-range accessory package
- KCI 50-round drum magazine gives the build a high-capacity Glock-pattern magazine option
The “Rucksack” Compact 9mm AR-9 Pistol Kit is based on the finished build from AT3’s AR-9 builder video series. Built around an Angstadt Arms Glock-compatible receiver set, 8.3″ AT3 9mm barrel, STNGR HWK handguard, AT3 9mm BCG, and Armaspec captured recoil system, this kit focuses on the parts that matter most for a reliable and well-thought-out PCC pistol. The OD green furniture, green dot, sling, weapon light, and 50-round drum give Rucksack a complete compact range and defensive-style setup without turning it into a generic AR-9 parts pile.
Note: This build includes a pistol brace. Firearm configuration rules, brace treatment, transport rules, and NFA requirements can vary and may change over time. It is the purchaser’s responsibility to ensure the final configuration complies with all applicable federal, state, and local laws before assembly or use. Do not configure this build with a stock unless all applicable NFA requirements have been met.
Kit Note: This product is sold as a parts kit, and final assembly is up to the purchaser. Parts and accessories are subject to change due to unforeseen shortages, compatibility updates, or compliance changes. Any substitutions will be of equal or greater value and will be noted in this product listing.
Specifications
- Build: Rucksack Compact 9mm 8.3″ AR-9 Pistol Kit
- Platform: AR-9 / PCC
- Caliber: 9mm
- Barrel Length: 8.3″
- Barrel Profile: Straight Profile
- Barrel Thread Pitch: 1/2×28
- Operating System: Direct Blowback
- Receiver Set: Angstadt Arms 0940 Upper/Lower Receiver Set
- Magazine Compatibility: Glock-Pattern 9mm Magazines
- Handguard Length: 7″
- Handguard Type: Free Float M-LOK
- Bolt Carrier Group: 9mm Nitride Bolt Carrier Group
- Charging Handle: Breek Arms Sledgehammer Gas Busting AR-15 Charging Handle
- Muzzle Device: Breek Arms Scorch 3-Prong Flash Hider for Breek-LOK 3QD
- Muzzle Device Thread Pitch: 1/2×28
- Trigger: Geissele G2S Two-Stage Trigger
- Brace: SB Tactical SBA4X AR-15 Pistol Brace
- Grip: Hogue Modular OverMolded Rubber AR-15 Pistol Grip
- Recoil System: Armaspec Gen 4 Stealth Recoil Spring for 9mm
- Primary Optic: AT3 ALPHA Micro Green Dot Sight
- Weapon Light: Streamlight ProTac Rail Mount 1L Dual Fuel Weapon Light
- Sling: Magpul MS4 Dual QD Sling
- Magazine: KCI USA 50-Round 9mm Drum Magazine for Glock-Pattern Pistols
What’s Included
Upper Assembly Components:
- Angstadt Arms 0940 Stripped Upper/Lower Receiver Set – Accepts 9mm and .40 S&W Glock Magazines
- AT3 9mm Straight Profile 8.3″ AR-15 Barrel
- STNGR HWK M-LOK Free Float Handguard – 7″
- Breek Arms Scorch 3-Prong Flash Hider for Breek-LOK 3QD – 1/2×28 for 9mm
- AT3 Tactical 9mm Bolt Carrier Group – Nitride
- Breek Arms Sledgehammer Gas Busting AR-15 Charging Handle
Lower Assembly Components:
- Geissele G2S for AR-15/AR-10 Combat Trigger
- AT3 Tactical AR-15 Ultimate Cerakote Color Upgrade Kit
- AT3 FU-BAG AR-15 Lost Parts Kit – Springs, Detents, Replacement Components
Recoil System & Furniture:
- Armaspec Gen 4 Stealth Recoil Spring for AR-15 – 9mm
- SB Tactical SBA4X AR-15 Pistol Brace – No Buffer Tube
- Hogue Modular OverMolded Rubber AR-15 Pistol Grip
Optics, Sights & Light:
- AT3 ALPHA Micro Green Dot Sight with Shake Awake and Cantilever Riser Mount
- Streamlight ProTac Rail Mount 1L Dedicated Fixed Mount Dual Fuel Long Gun Light – 350 Lumens
- Magpul MBUS AR-15 Front Back-Up Sight Gen 2
- Magpul MBUS Rear AR-15 Back-Up Sight Gen 2
Sling & Magazine:
