The N-Frame revolvers are the largest revolvers Smith & Wesson makes. The first N-Frame was the 44 Hand Ejector introduced in 1908, chambered in 44 Special. This was also called the New Century Model. The 44 Hand Ejector is essentially K-frame scaled up, with the addition of a locking point at the frame barrel-lug interface. This is the third lock that gives this gun it's nickname of the "Triple Lock". This third lock was dropped in 1915 (see III.B.2.d.1. Names and Numbers ) due to the cost of fitting
Historically this frame has been chambered in 45 ACP, 357 Mag. 44 Mag 38 Special, 38-40, 44-40, 44 Special, 455 Webely, 45 Colt, 10mm Auto, and 41 Magnum.
The current offerings are in 41 Magnum, 44 Magnum, and 45 ACP.
| Model 657 | Model 29 | Model 629 | Model 629 Classic | Model 629 DX | Model 625 | |
|---|---|---|---|---|---|---|
| Finish | Stainless | Blue Steel | Stainless | Stainless | Stainless | Stainless |
| Caliber | 41 Magnum | 44 Magnum | 44 Magnum | 44 Magnum | 44 Magnum | 45 ACP |
| Barrel Length | 6" | 6" 8 3/8" | 4", 6", 8 3/7" | 5", 6 1/2", 8 3/8" | 6 1/2", 8 3/8" | 5" |
| Front Sight | Pinned Ramp | Pinned Red Ramp | Pinned Red Ramp | Interchangable | Interchangable | Pinned Patridge |
| Rear Sight | Adjustable black blade | Adjustable white outline | Adjustable white outline | Adjustable white outline | Adjustable white outline | Adjustable black blade |
| Grips | Hogue | Hogue | Hogue | Hogue | Hogue and hardwood combat | Hogue |
| Weight | ||||||
| 4" | 44 oz. | |||||
| 5" | 51 oz. | 45 oz. | ||||
| 6" | 48 oz. | 47 oz. | ||||
| 6 1/2" | 52 oz. | 52 oz. | ||||
| 8 3/8" | 51.5 oz. | 54 oz. | 54 oz. |