The Bond Arms Backup is a two-shot .45 ACP derringer with a 2.5-inch barrel, stainless steel frame with black textured finish, and rubber grip. At 18.5 oz and 4.5 inches overall it is one of the more substantial derringers on the market, which helps manage the .45 ACP recoil. 
 

Key Specifications: 

• Model: Backup 
• Caliber: .45 ACP 
• Barrel Length: 2.5 inches 
• Capacity: 2 rounds 
• Weight: 1.2 lbs (18.5 oz) 
• Action Type: Single Action Only (SAO) 
• Overall Length: 4.5 inches 
• Sights: Blade Front, Fixed Rear 
• Grip Material: Black Rubber 
• Safety Mechanism: Cross-Bolt 
   

Detailed Features 

The single-action mechanism means the hammer must be manually cocked before each shot — deliberate rather than fast, which suits the Backup's role as a last-resort backup gun. The cross-bolt safety adds a secondary block. Bond Arms builds the Backup from stainless steel, so it handles humidity well. The rubber grip absorbs some of the .45 ACP impulse, and the textured surface keeps the gun from shifting during the shot. 
 

Target Audience 

Law enforcement and security personnel wanting a deep-concealment backup, experienced shooters who want a pocket gun in a serious caliber, and anyone who needs a very small pistol without dropping to .22 or .380. 
 

Usage Scenarios 

1. Deep Concealment Carry: At 4.5 inches it fits in a front pocket or ankle holster where nothing else will. 
2. Backup Gun: A natural fit as a secondary weapon when the primary needs to stay holstered. 
3. Outdoor Use: Two rounds of .45 ACP covers close-range threats in the field.

Users of the Bond Arms Backup generally appreciate the combination of .45 ACP power and genuinely small dimensions. The stainless construction gets good marks for durability and feel in hand. For the intended use — a close-range backup or pocket carry gun — most owners find it does the job.

The two-round capacity is the most frequently mentioned limitation, and it is an honest one. Anyone used to semi-automatics with double-digit magazines will feel the constraint. Recoil runs hot given the weight and barrel length; most describe it as manageable with practice, but some find extended sessions uncomfortable. Ergonomics on smaller hands come up as a concern, and accuracy beyond typical defensive distances is harder to achieve than with a full-size pistol. The overall read is that the Backup is a capable niche tool — not a general-purpose pistol, but a credible backup or pocket option for someone who has thought through what they need it to do.