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Adams Arms

Adams Arms Piston Kit P Series Adj Micro Block - Low Mass

Adams Arms Piston Kit P Series Adj Micro Block - Low Mass

Availability: In stock

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This system will work with .223/5.56 x 45 mm NATO.

Kit includes:

  • Patented One-Piece Bolt Carrier
  • P Series Micro Block - Adjustable (5 Settings - 100%/74%/53%/32%/11%)
  • Upper Receiver Bushing
  • Bushing Installation Rod
  • Bolt Spring
  • Drive Rod with Bushing and Spring
  • Installation Instruction Card

The Adams Arms Piston System:

  • A short stroke free floating piston system.
  • Is Self-Cleaning.
  • Carbon and gases are expelled forward, away from operator.
  • Corrosive resistant coating processes.
  • Harmonics are not transferred into the barrel.
  • Doesn't vent directly to atmospheric pressure; this eliminates flash signature and super sonic crack which is optimal for night vision and suppresses fire.
  • Has a Lifetime Warranty.


To select the correct length kit, use the following measurements:

  • Pistol: 4.846" from barrel extension to shoulder
  • Carbine: 7.866" from barrel extension to shoulder
  • Mid: 9.866" from barrel extension to shoulder
  • Rifle: 13.241" from barrel extension to shoulder
  • For 300BLK we only recommend a Pistol Gas Length and a Low Mass Carrier for optimal performance.

We recommend using a standard barrel nut or barrel nut with similar measurements for proper fit and function of the kit. Many aftermarket proprietary barrel nuts do not offer the clearance for the drive rod or proper seating of the spring and bushing.

Micro Gas Blocks should have the set screws torqued to 87 in-lbs

Additional Info

Additional Info

Manufacturer Adams Arms
Finish No
Barrel Length No
Caliber No
Option No
Gas Length No
Height No
Rail Length No
Mount No
Profile No
Reticle No
Co Witness No
Size No



Feel free to ask us any question regarding this product.