PERUN X-Series

A Hybrid locked rotating bolt captive gas piston operated rifle with compatibility to AR parts.


The single balanced upper with limitless customization to fit the user, the environment, the purpose.


The Perun is an upper that is designed to use AR lower receivers (with minor modification) and any AR parts such as triggers, barrels, gas blocks (adjustability is preferred), furniture, and stocks (including folding stocks or braces using Picatinny mounts).

The X16 chambers .223/5.56x45mm and can be adapted to .300 Blackout, 6-ARC, 6.5-Grendel and 7.62x39mm.


The X17 chambers .308 and can be adapted to 6.5 Creedmoor.


  • The lessened reciprocating action with lighter bolt group is moved to the rifle's center, which lowers felt recoil, barrel flex, and better weight distribution.

  • Unlimited flexibility on barrel changes with the use of common AR parts.

  • Without a piston system on the barrel, the free-floating characteristics and accuracy of the DI system are achieved on the Perun hybrid piston system.

  • No carrier tilts.

  • No buffer tube needed.

  • Spacious internal enclosure to reduce soot buildup in critical parts.

  • Efficient piston/chamber design to effectively cycle .300 Blackout subsonic unsuppressed. 

  • Significantly reduced heat build-up at forward grip compared to typical piston systems.



The Perun can be sold as just the upper receiver with the option of bundling different handguard and receiver lengths to fit users' desired barrel length or be sold complete with pre-built parts and accessories. 

  • Compatibility with any AR stock or folding (SIG, SCAR, ACR) stock/brace.

  • AR Pencil or Ultralight barrels are available, which are typically not recommended for piston rifles.

  • Lower customization cost using common AR parts.

  • Higher rails for quicker sighting while optionally maintaining co-witness with iron sights.

  • Monolithic upper for consistent return to zero.

  • Non-reciprocating charging handle that can be customized to either side of the rifle.

  • Configurable upper Picatinny rail and handguard M-LOK lengths to fit accessories and support hand preferences.

  • Ultralight and compact piston rifles can be achieved using polymer lowers, pencil barrels, and lightweight folding stocks.