1.125-28 Alpha Extension

Price range: $59.00 through $69.00

"1.125-28 Alpha Extension" added to wishlist
Please login to continue

Description

This extension is designed to provide some additional clearance with muzzle devices that many of the pistol suppressors with this female thread were never meant to accommodate.   It is needed to use self-contained 3 lug adapters in our Canine model.

 

It is generally NOT able to accommodate boosters due to the inside diameter; please check the outside diameter in front of the threads on any booster assembly or 3 lug adapter before ordering this to use with it.  Our Alpha booster DOES NOT fit through this extension.

 

*Stacking extensions is not recommended, and if done for the purpose of increasing blast chamber volume could be considered the making of a new silencer by ATF.  If you choose to do so, it is at your own risk.

 

Material: 17-4 H900 stainless steel, 6Al-4V Gr. 5 Titanium

Length: .95″

Flange thickness: .55″

Flange diameter: 1.24″, 1.20″ at rear face

Through Inside Diameter: 1.0″

Weight: .8 ounces stainless, .45 ounces titanium

Internal thread: 1.125-24, .45″ deep

External thread: 1.125-24, .4″ tenon

 

In Stock Natural products ship within 1-2 business days. While we usually have SOCOM Black on hand to ship within 1-2 business days, color selections may add up to 10 business days to ship time.

Before placing your order, please reference the provided dimensions and compare with your application to ensure this product fits so as to avoid return shipping and restocking costs.

Additional information

Material

17-4 H900 Stainless Steel, Gr. 9 CWSR Titanium

Moly Resin

Foliage Green, Light Grey Flat, Natural, Natural 17-4 H900, Burnt Bronze, Coyote Brown, Tan FDE, SOCOM Black, Grey-Black Colt Flat, OD Green, Flat Brown

2 responses to “1.125-28 Alpha Extension”

    Steven Adelmann
    December 15, 2025
    I highly recommend this adapter. It's an excellent option for Silencerco's Spectre9 when using the ASR adapter. Inexplicably, SCO claims their Alpha ASR adapter works with the Spectre9 and their ASR mounts, but the front of the ASR flash hider makes contact with the blast baffle before the suppressor fully seats. Thankfully, ECCO Machine has a solution in this Alpha-to-Alpha adapter. Mine arrived today, I installed it on a suppressor and both fit and alignment were perfect. ECCO does excellent work, the prices for their products and services are very fair and they're great folks to deal with. I've used their products and machining services in the past and have had equally excellent results each time. Thanks for knocking it out of the part again ECCO!
    Jacob Erickson
    December 10, 2024
    I needed a smidge more blast chamber depth on a Spectre9 and this was the best option I could find. (If anyone is listening an "L" Alpha Plan A mount would be great. This is masterfully made for how inexpensive it is. Great testament to Ecco's experience in manufacturing.

Leave a Reply

Your email address will not be published. Required fields are marked *

Compare Products