Aim7 Alpha Series 1.125-28 Booster Assembly Stainless Steel Fits BPISTIN /Alpha

Description

1.125-28 Booster Specs: 

Overall length w/cap: 2.03″

Flange length: .5″

Flange diameter: 1.28″

Body diameter: 1.08″

Thread tenon length: .365″

Distance from flange shoulder to front of booster: 1.2″

Weight W/O Piston: 2.2 ounces

Piston Compatibility This assembly accepts the following BPISTIN pattern 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: Rad 9 & 45 pistons

• YHM: Current booster assembly pistons

• Griffin Armament: Cam Lok or EZ Lok pistons (SilencerCo/Rugged pattern)

Alpha Accessory Compatibility The assembly also features female threads compatible with Alpha-pattern accessories, including:

• Griffin Cam Lok 1.125-28 Direct Thread adapter & Plan A Alpha

• SilencerCo AC2447 & AC2448 3-lug adapters, ASR Alpha, and Harvester 300 Direct Thread

• Q Plan B Alpha

• And other standard Alpha-pattern mounts

• 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.

⚠️ Important Compatibility Warnings

• Check Dimensions: Please verify dimensions below before ordering to ensure fitment and avoid restocking fees.

• Exclusions: This booster is NOT compatible with the PTR Vent 2.

• Integral Housings: This item is NOT needed for (and cannot be installed on) suppressors that already have an integrated booster housing.

PLEASE NOTE:

• Not compatible with the PTR Vent 2.

• Do not purchase this for suppressors with integrated booster housings; it will not fit.

• Please verify your dimensions below to prevent return shipping/restocking fees.

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 Material Overview: SUS303 Stainless Steel

This muzzle brake is manufactured from SUS303 (equivalent to AISI 303), an austenitic stainless steel known for its ease of machining and corrosion resistance.

Property	Description
Composition	Fe, 17–19% Cr, 8–10% Ni, ~0.15% S, ~1% Mn
Machinability	Excellent (better than SUS304)
Corrosion Resistance	Good, slightly lower than SUS304
Tensile Strength	Moderate (500–750 MPa)
Weldability	Poor (due to sulfur content)
Magnetism	Non-magnetic (annealed condition)

SUS303 is a good choice for civilian semi-automatic rifles and moderate use, but it is not intended for extreme military-grade abuse.