Booster Pistons, BPISTIN Pattern




These 17-4 H900 booster pistons are in the pattern we have coined as BPISTIN, a homophonic acronym which stands for:

Booster Piston, Industry Standard Ten Index Notch

They will fit:

-All ECCO Machine booster assemblies and pistol suppressors

-All SilencerCo booster assemblies and pistol suppressors

-Rugged Obsidian 9 & 45

-Dead Air Odessa

-OSS Rad 9 & 45

-Current YHM booster assembly

Though nearly identical and able to install in Griffin boosters, Griffin pistons have a slightly larger flange, so the BPISTIN pattern will be sloppy in them and may cause detrimental misalignment.

1/2-28 and 5/8-24 pistons are through-threaded, all others have a muzzle register at a depth of .43″/11mm.


Additional information

Piston Thread Pattern

.578-28, 1/2-28, 5/8-24, 9/16-24, M13.5x1LH, M14x1RH, M16x1LH, M16x1RH


    Augustine E Miranda
    October 1, 2022
    I love this product; I purchase three of them! With different thread pattern. Great craftsman ship and customer services. I highly recommend Ecco machine for all your suppressor needs.
    August 20, 2022
    Very happy with the products and services.

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Booster Pistons, BPISTIN Pattern
Booster Pistons, BPISTIN Pattern
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