The Kel-Tec SU-16A is a semi-automatic rifle chambered in 5.56mm NATO / .223 Remington with an 18.5-inch barrel and a folding stock. It's a lightweight polymer rifle built for users who want something portable without going to a pistol-caliber platform. 
 

Key Specifications 

• Barrel Length: 18.5 inches 
• Caliber: 5.56mm NATO / .223 Remington 
• Capacity: 10 rounds 
• Weight: 5 lbs (80 ounces) 
• Total Length: 37.4 inches 
• Manufacturer: Kel-Tec 
• Model Number: SU16AGRN 
   

Features 

Front and rear sights are adjustable. The 18.5-inch barrel has a salt bath nitride finish for corrosion resistance. The synthetic green grip and stock reduce weight and handle weather. A crossbolt safety is the primary fire-control mechanism. 
 
At 5 lbs and 37.4 inches, the SU-16A is easy to carry. The folding stock makes storage and transport straightforward. The 18.5-inch barrel is 2.5 inches longer than the SU-16C, which recovers some muzzle velocity from the 5.56 cartridge.

Discussion of the SU-16A is largely practical, focused on a few consistent themes.

Lightweight and portability come up most often as positives. At 5 lbs with a folding stock, it's easy to transport and maneuver. Users who need a compact rifle for storage or carry tend to like it.

Versatility is mentioned frequently (home defense, range use, light hunting), and AR-15 magazine compatibility is seen as a practical advantage. Affordability is another common point; most buyers consider it a reasonable value.

Reliability feedback is mixed. Many owners report no issues, but feeding and cycling problems with certain ammunition types come up enough to be worth noting. Sticking to quality brass-cased ammunition and keeping the rifle maintained appears to address most of these concerns.

Ergonomics are polarizing. Some shooters find it comfortable; others find the stock fit and cheek weld less than ideal. Build quality opinions follow a similar split. The polymer construction is fine for what it is, but shooters used to metal-framed rifles sometimes find it lacking.

Customization options (optics, grips, lights) are available and get positive mentions from owners who like to configure their rifles for specific tasks.