The Tisas PX-5.7 is a single-action semi-automatic pistol chambered in 5.7x28mm with a 4.8-inch barrel and a 20+1 capacity. The polymer frame keeps weight at 3.3 lbs. and the 8.2-inch overall length puts it in a compact-to-mid-size category. Two magazines are included. 
 

Key Specifications 

• Manufacturer: Tisas 
• Model: PX-5.7 
• Type: Semi-Auto Pistol 
• Action: Single Action 
• Caliber: 5.7x28mm 
• Barrel Length: 4.8 inches 
• Overall Length: 8.2 inches 
• Capacity: 20+1 rounds (two magazines included) 
• Weight: 3.3 lbs. 
• Frame Material: Polymer 
• Slide Finish: Matte Black 
• Safety Features: Three Auto Safeties 
• Sights: Fiber Optic Front / Adjustable Rear 
   

Features 

The 5.7x28mm cartridge runs at high velocity with recoil that's noticeably lighter than most service pistol calibers, which keeps the muzzle flat through a 20-round magazine. The flat-face trigger is designed for a consistent finger placement and a clean break. Fiber optic front and adjustable rear sights work in variable lighting. Three automatic safeties provide passive drop and firing-pin protection. An integrated Picatinny rail accepts lights and lasers. Interchangeable backstraps let you adjust grip depth to fit different hand sizes.

The PX-5.7 draws a lot of interest from shooters who want the 5.7x28mm caliber at a price point below the FN Five-seveN, and most feedback reflects that framing.

The caliber itself generates genuine enthusiasm. Low recoil and high velocity are consistently highlighted as real-world advantages, not just spec-sheet talking points. Follow-up shots stay flatter than with comparable centerfire pistols, and the 20+1 capacity adds to that.

Ergonomics come up positively. Most owners find the grip comfortable and the controls accessible without repositioning the hand.

The fiber optic sights are a consistent positive -- they pick up in low light and improve target acquisition over standard black irons.

Build quality feedback is mixed. Some owners report no complaints after extended use; others note fit and finish details that don't match more established brands at similar price points.

Reliability shows the widest variance in reviews. Many shooters run the gun without issues; a minority report feeding or ejection inconsistencies. Ammunition selection appears to influence this significantly.

Aftermarket support is more limited than for mainstream platforms like Glock or CZ, which matters for holster selection in particular.

Comparisons to the FN Five-seveN are unavoidable in discussions. The Tisas is consistently framed as the accessible option for the caliber, and most buyers who go in knowing that come away satisfied.