Piston Kit & Rail Combo




SPECIAL! AARS 15″ or 12″ Rail with Carbine or Mid Length Micro Piston Kit — WHILE SUPPLIES LAST!


No longer worry about finding a compatible handguard with our piston system. This is a one stop purchase. Get your Adams Arms Piston kit with a rail that requires no modification for install.

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%)
  • 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:

  • Carbine: 7.866″ from barrel extension to shoulder
  • Mid: 9.866″ from barrel extension to shoulder


Micro Gas Blocks should have the set screws torqued to 55-77 in-lbs


Installation Instructions: CLICK HERE


The new Adams Arms AARS M-LOK Rail was designed for our P Series Lineup of rifles. Designed and engineered to be multi-purpose, the AARS Rail has a rigid and ergonomic design and features that make this the best choice for everyday enthusiasts, avid shooters, 3-gun competitors, law enforcement, military, and everything in between. This rail is compatible with any of the Adams Arms low profile piston systems and most standard mil-spec AR-15 rifles.



  • Full length lightened picatinny rail
  • M-LOK® attachment points at 3, 6, and 9 o’clock
  • 4 QD attachment points
  • Weight-reduction cuts
  • Ergonomic finger grooves


  • AARS M-LOK Rail
  • Proprietary Barrel Nut
  • (4)  Screws


6061 T6 Aluminum
Inside Diameter
Outside Diameter
10.528 oz (14.3 oz with barrel nut & hardware)

Additional Information

Weight 2 lbs
Dimensions N/A


Adjustable Kit Length:


Save 20% on MSRP across all products!
Discount will be applied at checkout.
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