Aim7 Alpha Series 1.125-28 Booster Assembly Stainless Steel Fits BPISTIN /Alpha
Compatibility Notice: This list refers to piston compatibility, not suppressor models. If your suppressor has an integrated booster housing, this part is not required and will not fit.
Versatile Connectivity: Our Alpha boosters feature female threading for Alpha-pattern accessories, including the Griffin Cam Lok 1.125-28, Griffin Plan A Alpha, SilencerCo 3-lug and ASR Alpha adapters, Q Plan B Alpha, and more.
Important Restrictions: These boosters are not compatible with the PTR Vent 2. Please review the dimensions below carefully before ordering; we cannot accept returns for compatibility errors.
***These boosters are NOT compatible with the PTR Vent 2. THIS IS NOT NEEDED FOR AND CANNOT BE INSTALLED IN ANY SUPPRESSOR THAT HAS AN INTEGRATED BOOSTER HOUSING. Please reference the dimensions below to ensure compatibility with your application before ordering to avoid return shipping and restocking fees on an item you cannot use.
PISTON OPTIONS:
1/2 x 28 TPI (CZ, 1911, FNH, S&W 9MM,22LR)
1/2 x 36 TPI (9MM)
5/8 x 24 TPI (.30 CAL)
9/16 X 24 TPI (.40 CAL)
.578 X 28 (.45ACP)
M13.5 X 1LH (GLOCK, STYER, SIG, HK, B&T 9MM)
Description
Aim7 Alpha Series 1.125-28 Booster Assembly Stainless Steel Fits BPISTIN / Alpha
The Aim7 Alpha Series 1.125-28 Booster Assembly is a precision-engineered recoil decoupling booster designed for modular Alpha-pattern platforms. Precision CNC-machined from corrosion-resistant SUS303 stainless steel, this assembly temporarily decouples front-end suppressor mass on semi-automatic tilt-barrel handguns, ensuring reliable cycle timing, clean ejection, and uninterrupted feeding.
Engineered with standard 1-1/8×28 (1.125×28 TPI) Alpha female threading, it offers seamless integration with industry-standard BPISTIN-pattern pistons and Alpha mounting accessories, delivering reliable POI repeatability and smooth slide performance.
Key Features & Performance
- Tilt-Barrel Decoupling: Relieves muzzle mass from Browning-type tilting barrels to ensure smooth, factory-reliable slide cycling on host pistols.
- Alpha 1.125×28 Connectivity: Features industry-standard Alpha female threads accepting a wide variety of direct-thread mounts, 3-lug bases, and taper adapters.
- Broad BPISTIN Compatibility: Built to house all standard BPISTIN (Booster Piston, Industry Standard Ten Index Notch) pistons for multi-caliber adaptability.
- SUS303 Stainless Steel Construction: Precision-machined from solid austenitic stainless steel for high dimensional concentricity, heat dissipation, and long-term corrosion resistance.
- Compact & Lightweight: Compact 2.03″ total length with cap, weighing just 2.2 oz (without piston) to keep front-end balance agile.
System Specifications & Dimensions
| Thread Interface | 1.125×28 TPI (1-1/8×28) Alpha Pattern |
|---|---|
| Overall Length w/ Cap | 2.03″ |
| Flange Dimensions | Length: 0.50″ | Diameter: 1.28″ |
| Body Diameter | 1.08″ |
| Thread Tenon Length | 0.365″ |
| Flange Shoulder to Front | 1.20″ |
| Weight | 2.2 oz (without piston) |
| Material & Finish | SUS303 Stainless Steel (Matte Black Finish) |
Piston Thread Pitch Variations
| 1/2×28 TPI | Standard 9mm handguns (CZ, 1911-9, FN, S&W) & .22 LR rimfire |
|---|---|
| M13.5×1 LH | European 9mm factory barrels (Glock, SIG Sauer, HK, Steyr, B&T) |
| .578×28 TPI | Standard .45 ACP platforms (1911, FN 545 / FNX-45, Glock aftermarket) |
| 5/8×24 TPI | .30 Caliber & .300 BLK subsonic handgun/PCC setups |
| 9/16×24 TPI | .40 S&W platforms & select .45 ACP configurations |
| 1/2×36 TPI | Colt-pattern 9mm PCC and specialized threaded barrels |
System & Accessory Compatibility
| Accepted BPISTIN Pistons | • ECCO Machine (all booster pistons) • SilencerCo (all booster pistons) • Kaw Valley Precision (all booster pistons) • Rugged (Obsidian 9 & 45 pistons) • Dead Air (Odessa pistons) • OSS / HUXWRX (RAD 9 & 45 pistons) • YHM (current booster pistons) • Griffin Armament (CAM-LOK / EZ-LOK SilencerCo/Rugged pattern) |
|---|---|
| Alpha Accessory Mounts | Griffin CAM-LOK 1.125-28 Direct Thread adapter & Plan A Alpha, SilencerCo AC2447 & AC2448 3-lug adapters, ASR Alpha, Harvester 300 Direct Thread, Q Plan B Alpha, and standard 1.125×28 Alpha accessories. |
- Integral Housings: This assembly is NOT compatible with, and cannot be installed on, suppressors that already feature an integrated booster housing.
- PTR Vent 2 Exclusion: This booster is NOT compatible with the PTR Vent 2.
- Verify Dimensions: Please review all listed dimensions prior to ordering to prevent return shipping and restocking fees.
Material Overview: SUS303 Stainless Steel
Manufactured from SUS303 (equivalent to AISI 303) austenitic stainless steel, engineered for superior machining precision and balanced corrosion resistance:
| Composition | Fe, 17–19% Cr, 8–10% Ni, ~0.15% S, ~1% Mn |
|---|---|
| Corrosion Resistance | Good; shields against powder fouling & moisture |
| Tensile Strength | 500–750 MPa |
| Magnetism | Non-magnetic (annealed condition) |
Due to California Assembly Bill 1263 (AB-1263) compliance regulations and online sales verification requirements for firearm accessories, WE DO NOT SHIP THIS ITEM TO CALIFORNIA ADDRESSES. Any orders placed with a California shipping address will be canceled immediately.
Important Disclosures & Compliance
- Classification Notice: THIS ITEM IS NOT A SILENCER, SUPPRESSOR, OR NFA COMPONENT. It is strictly a mechanical recoil decoupling housing sold exclusively for cycling facilitation on semi-automatic tilt-barrel handguns. It contains no acoustic baffles, internal packing material, or sound-diminishing components, and does not alter or suppress the report of a firearm.
- Concentricity & Pre-Fire Inspection: Always verify bore alignment, concentricity, and caliber clearance across your full assembly using a certified alignment rod prior to live fire. Installation by an experienced armorer or gunsmith is strongly recommended.
- Legal & Export Compliance: Buyer assumes full responsibility for compliance with all applicable local, state, and federal laws. Strictly subject to U.S. export regulations (ITAR/EAR)—U.S. sales only.
- Proposition 65 Warning: This product may contain trace chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Additional information
| Thread Pitch: | .578X28, 1/2 x 28 Steel, 1/2 x 36 TPI, 5/8 x 24 TPI, 9/16X24, M13.5X1LH |
|---|
