Adams Arms Piston Kit P Series Adjustable Micro Block

Adams Arms Piston Kit P Series Adjustable Micro Block

Model:  PKM-ADJ

$359.99  $299.95 

Manufacturer:  Adams Arms

Availability : In-Stock

Available Options:
 None   Add Voodoo BCG Completion Kit ( + $94.95 )
Kit Options: Basic Kit  
Upgrade to Low Mass Carrier ( + $30.00 )


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Adams Arms Piston Kit P Series Adjustable Micro Block


1) 300BLK kit. Adams newest kit is engineered specifically for the needs of 300BLK and features a larger drive rod cup and larger gas channel to capture more gas pressure. This is a pistol length gas system. 300BLK KITS MUST BE ORDERED WITH A LOW MASS CARRIER FOR PROPER FUNCTION SO THAT ACCOUNTS FOR THE UPCHARGE. YOU DON'T HAVE TO SELECT LOW MASS ALSO, IT IS AUTOMATICALLY ASSUMED WITH 300BLK Length Piston Kit P Series Adjustable Micro Block FGAA-03300 SELECTION.

2) 5.56 PISTOL kit. Adams Arms PISTOL Length Piston Kit P Series Adjustable Micro Block PKP-ADJ

3) 5.56 CARBINE kit. Adams Arms CARBINE Length Piston Kit P Series Adjustable Micro Block PKC-ADJ

4) 5.56 MIDLENGTH kit. Adams Arms MID Length Piston Kit P Series Adjustable Micro Block PKM-ADJ

5) 5.56 RIFLE kit. Adams Arms RIFLE Length Piston Kit P Series Adjustable Micro Block PKR-ADJ

The 5.56 system will work with either .223 Remington or 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%)
  • Bolt Spring
  • SIZE APPROPRIATE 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.

This system requires a .750" gas seat.

We recommend using a standard milspec barrel nut (such as DPMS sold on website) 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.

Optional Upgrades:

  • Low Mass Carrier
  • Nickel Boron (Silver)
  • Low Mass Nickel Boron
  • VOODOO (a subsidiary of Adams Arms) Bolt Carrier Group BCG Upgrade kit. Allows you to complete your bolt carrier with the same superior LifeCoating that Adams uses on their Bolt Carrier. This BCG Upgrade kit includes a LifeCoated: 5.56 Bolt, Cam Pin, Firing Pin, Cotter Pin

LifeCoat is more than just an application or coating processes. It is the most technologically advanced coating processes, material and machining available on the market today. LifeCoat is the idea that certain processes and materials are superior for their applicable needs and when combined they offer efficiencies unparalleled to anything currently available.

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

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