The Sphinx SDP Compact Duty Black is a DA/SA 9mm pistol manufactured in Switzerland. It is hammer-fired with an ambidextrous decocker and uses a CZ-75-derived internal design, which means the slide rides inside the frame rails for a low bore axis. The combination of an aluminum frame and PVD-coated steel slide keeps weight at 29.06 oz. 
 

Key Specifications 

• Type: Hammer Fire 
• Series/Collection: Sphinx SDP Compact Duty Black 
• Action: Single/Double 
• Caliber/Gauge: 9x19mm Parabellum 
• Capacity: 17 rounds 
• Sight: Iron Blade with White Dot Front, Serrated U Shape Rear 
• Sight Radius: 5.7" 
• Slide Material: PVD Coated Black Steel 
• Safety Feature: Ambidextrous Decocker 
• Grip Type: Black Polymer 
• Trigger Pull Weight: 4+ lb Single Action; 10+ lb Double Action 
• Barrel Material: 4140 Pre Hardened Steel 
• Frame Material: Aluminum 
• Barrel Finish: Black Nitride (QPQ) 
• Frame Finish: Hardcoat Anodized Black 
• Barrel Length: 3.7" 
• Overall Length: 7.4" 
• Weight: 29.06 oz 
• Overall Height: 5.5" 
• Overall Width: 1.37" 
• Twist Rate: 1:10" 
• Barrel Grooves: 6 
• Magazine Release Position: Left/Right - Reversible 
• Grip Inserts Available: Small, Medium, Large 
   

Detailed Features 

The ambidextrous decocker allows safe hammer lowering from either side, making reholstering more consistent under pressure. The reversible magazine release accommodates left-handed shooters without modification. Grip inserts in three sizes are included, so fit can be adjusted without buying aftermarket parts. 
 
The 4140 pre-hardened steel barrel with QPQ nitride finish provides corrosion resistance and hardness without adding weight. The aluminum frame with hardcoat anodize is more durable than bare aluminum and lighter than steel. PVD coating on the slide is more wear-resistant than standard bluing.   

Build quality is consistently the first thing people mention. The Swiss manufacturing and the materials specification get direct credit; owners describe it as feeling more precisely assembled than comparable pistols at similar price points. The aluminum frame and coated slide hold up well through regular use.

Shooting feel is generally positive. Recoil is mild for a compact 9mm, which the low bore axis from the CZ-derived rail system contributes to. Accuracy at range is cited as a strength.

Ergonomics are well-received, particularly the grip insert system, which solves fit for shooters who find most factory grips too large or too small.

The most common criticism is availability. The Sphinx brand is not widely distributed in the U.S., which makes finding holsters, magazines, and service options harder than it would be for a Glock, SIG, or HK. Price is the other consistent discussion point: it sits above mainstream alternatives, and while most owners consider it fair for the quality, it narrows the audience. The aftermarket parts ecosystem is thin compared to more popular platforms.