The FN Five-seveN is a single-action 5.7x28mm pistol with a 4.8-inch barrel and 10+1 capacity. At 21 oz (1.3 lbs), the polymer frame keeps the weight down despite the full-size grip. Adjustable 3-dot sights and ambidextrous safety are standard. The matte black finish is the only color option here. 
 

Key Specifications 

• Brand: FN 
• Model Name: Five-seveN 
• Caliber: 5.7x28mm 
• Action Type: Single Action Only (SAO) 
• Capacity: 10+1 rounds 
• Barrel Length: 4.8 inches 
• Weight: 1.3 lbs (21 oz) 
• Sights: Adjustable 3-Dot 
• Grip Material: Black Textured Polymer 
• Safety Feature: Ambidextrous 
   

Detailed Features 

 
The 5.7x28mm cartridge is the reason most people choose this gun. It produces notably lower recoil than 9mm at similar velocities -- the round is essentially bottlenecked rifle-caliber in a pistol package. That makes rapid follow-up shots easier to control. The high-velocity, flat-trajectory round also has a reputation for feeding cleanly. 
 
The SAO trigger is light and consistent. The ambidextrous safety operates identically from either side. The adjustable rear sight allows basic windage tuning. The textured polymer grip is slim for a 10-round gun, which helps with concealment. 
 

Usage 

• Home defense: the low recoil and 10+1 capacity work well; the high-velocity round's terminal performance at home defense distances is an ongoing discussion in gun circles. 
• Sport shooting: the flat trajectory and low recoil make it competitive in events where rapid fire accuracy matters. 
• Concealed carry: at 21 oz it's lighter than many full-size 9mm pistols.

The Five-seveN SAO generates consistent enthusiasm around the 5.7x28mm cartridge and some recurring frustration around the price and ammo costs.

Positive feedback:

• The 5.7x28mm cartridge's low recoil relative to velocity is the most cited positive. Users report noticeably easier target reacquisition compared to 9mm.
• Accuracy gets strong marks at typical pistol distances, with several users noting tight groups from the 4.8-inch barrel.
• The lightweight (21 oz) for a full-size gun is well received, especially for carry use.
• Adjustable sights are a practical inclusion at this price point.

Common complaints:

• Price: both the gun and the ammunition cost more than comparable 9mm options, which limits how often buyers shoot it.
• Ammo availability: 5.7x28mm is less stocked than major calibers and disappears quickly during shortage periods.
• Ergonomics: grip size and angle get mixed reviews -- some shooters find it awkward, particularly those with smaller hands.
• The military/law enforcement associations of the 5.7 round generate occasional controversy in discussions.