The Pioneer Arms GROM Series is a semi-automatic AK-47 style rifle chambered in 5.56x45mm with a 16-inch barrel. It has a laminated wood handguard with an underfolder stock and includes a faux suppressor on the muzzle. The rifle ships with one 30-round magazine. 
 

Key Specifications 

• Brand: Pioneer Arms 
• Model: GROM Series 
• Caliber: 5.56x45mm 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 16 inches 
• Color/Finish: Laminated wood 
   

Detailed Features 

• AK-47 pattern with underfolder stock for a compact folded profile 
• 16-inch barrel chambered in 5.56x45mm 
• Laminated wood handguard 
• Faux suppressor on muzzle 
• Includes one 30-round magazine

Owners of the Pioneer Arms GROM are drawn to the underfolder stock as both a practical and aesthetic feature. It gives the rifle a more compact folded length than a fixed-stock AK, and the laminated wood handguard gives it a period-correct look that synthetic furniture doesn't replicate.

The faux suppressor is purely cosmetic, and opinions on it split predictably. Some buyers find it a clean finish to the muzzle end; others remove it immediately in favor of a functional muzzle device. The 5.56x45mm chambering in an AK platform draws the same discussion as other Pioneer Arms offerings in this caliber.

Build quality on the GROM is generally rated as consistent with other Polish Pioneer Arms production. The underfolder mechanism gets scrutiny for wobble and lock-up, which varies between individual rifles. Buyers who inspect the fold and lock function before purchase are more satisfied than those relying on consistency.