Superlative Arms Adjustable Piston Conversion Kit – .625″

$289.99 $260.99

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Superlative Arms Adjustable Piston Conversion Kit – .625″

Piston Conversion Kit – Low Profile, Adjustable, Forward Venting “Bleed Off.”

The Superlative Arms patented “Bleed Off”, Gas Adjustable Piston Conversion Kit / System for the AR15 platform adjusts the gas flow by bleeding the gas out of the block instead of restricting the flow like conventional adjustable blocks. Results:

  • The pressure used in the block is reduced only to the amount required to drive the bolt carrier. The remaining gas / pressure are bled out of the block allowing the system to run much cleaner and cooler.
  • Reduction of felt recoil.
  • Patented adjustment detent is located outside of the block and therefore no contamination.
  • The gas adjustment screw does not restrict the gas flow; therefore there is no erosion or seizing of the screw / no loss of detent due to carbon build up. Although it is removable, we have added a safety mechanism, which stops you from unintentionally backing the screw all the way out.
  • When using SBR’s and / or suppressors the bleed off port allows the excessive pressure to be exhausted out of the block reducing blow back.
  • Available in Pistol, Carbine, Mid-Length and/or Rifle Gas configuration.
  • Select your mounting style – Clamp-On or Solid (Set Screw).

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* Buy the Conversion Kit for .750 Barrels here*

*Toolcraft AR15 Bolt Kits – Sold here*



  • Piston Block Assembly
  • Carrier – (Bolt Not Included)
  • (1) 3/32″ x 6″ Hex Key (Gas Screw Adjustment Tool)
  • (1) 9/64 x 6″ Hex Key (Gas Block Plug Installation Tool)
  • (1) Bushing and insert tool (Extras – Use At Your Discretion)
  • Installation Instructions & QR Code for Video Tutorial


Product Information

Manufacturer: Superlative Arms
Item #: SABO-PS-625
Platform: AR15
Barrel Diameter: 0.625″
Weight: 13.1oz
Gas System:  Pistol | Carbine | Mid Length | Rifle
Piston Block Attachment Type: Solid (Set Screw) | Clamp-on
Piston Block Material & Finish: 416 SS, Melonite
Carrier:  Ion Bond, 1pc. Carrier w/ Skis and Dimpled Key
Gas Adjustment:  30 Locked Positions (Front Adjust)
Bleed Off Port:  Front of Block
MSRP: $289.99

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Weight 30 oz
Dimensions 17 × 3 × 2 in

Superlative Arms

Part Type

Upper Receiver Parts



Gas Block Diameter


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