Hammers 3-9x40AO .177 .22 Magnum Spring Air Gun Rifle Scope with Mount
- Rifle Scope
- 40 mm
- 3x
- 9x
- More reviewed than 93%
A budget airgun scope that most reviewers found accurate and good value, though results on higher recoil nitro piston rifles have been mixed, with a small number reporting early failure.
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How it ranks among the 359 rifle scopes we track
4.0★ across 755 Amazon ratings, Bayesian-smoothed toward the category average.
755 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 359 rifle scopes we track - how the scorecard works · full rifle scopes data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 22, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
A 3-9x40 rifle scope built specifically for spring and piston air rifles up to .22 caliber, with internal reinforcement for the two-way recoil these guns produce that regular firearm scopes are not built to survive.
Spring and piston air rifles recoil twice, once forward and once back, which cracks the internals of scopes designed only for firearm recoil. This one is built around that specific failure mode, and most reviewers who mounted it on gas piston or spring guns reported it held zero well. Results split on higher recoil nitro piston rifles: several owners got months of reliable use while at least one reported internal failure within about 80 shots, and another had a stop pin snap after a month of use.
- 3-9x variable zoom with 40mm adjustable objective
- Reinforced internals for piston air rifle recoil
- One-piece mount with removable recoil stop pin
- Fingertight metal windage and elevation turrets
What buyers say
From Amazon customer reviews.
Most reviewers who mounted this on spring or gas piston air rifles reported it held zero reliably and praised the metal turret caps and clear glass for the price. Results were mixed at the higher end of recoil: one reviewer said the scope failed internally within about 80 shots on a nitro piston rifle, and another had the mount's stop pin snap after roughly a month of use, while several others reported no issues after a full season of shooting. One buyer also found the elevation adjustment could not raise the point of aim enough on their particular rifle, though they noted this may be specific to that gun and mount combination.
Strengths and trade-offs
Drawn from this product's published specifications.
- At least one reviewer had it fail within about 80 shots on a nitro piston rifle
- A stop pin snapped for one reviewer after roughly a month of use
- One buyer hit an elevation limit that would not move point of aim high enough
Specifications
| Brand | Hammers |
|---|---|
| Model | SA3940AO |
| Dimensions & fit | |
| Objective Lens Diameter | 40 mm |
| Item Weight | 1.5 pounds |
| Construction & materials | |
| Material Type | Aluminum |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Dovetail Mount |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 1 |
| Included Components | One piece scope mount with stop pin |
| Other details | |
| Magnification Minimum | 3x |
| Magnification Maximum | 9x |
| Sport Type | Hunting |
| Reticle Type | Wire |
| Night vision | No |
| Product Style | Variable Power Air Rifle Scope |
| Field Of View | 39.3 Feet |
Other Hammers rifle scopes
How it compares
This product against the closest alternatives we track in rifle scopes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Hammers 3-9x40AO .177 .22 Magnum Spring Air Gun Rifle Scope with MountThis product | 4.0 / 5 | 755 | 3.6 / 5 |
| UTG 3-12X44 30mm Compact ScopeUTG | 4.5 / 5 | 3,000 | 4.4 / 5 |
| Vortex Optics Diamondback Second Focal PlaneBrand | 4.7 / 5 | 1,500 | 4.3 / 5 |
| PINTY Tactical Rifle Scope Combo: Illuminated OpticsPinty | 4.4 / 5 | 1,100 | 4.3 / 5 |
| Firefield RapidStrike 1-6x24 SFP Riflescope KitFirefield | 4.5 / 5 | 900 | 4.3 / 5 |
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Questions about the Hammers SA3940AO
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What air rifles is the Hammers 3-9x40AO scope built for?
It is designed for spring and piston air rifles up to .22 caliber and is internally reinforced for the two-way recoil those guns produce.
Does the Hammers scope hold zero on air rifles?
Most reviewers reported it held zero well across a season of shooting, though a small number reported issues on higher recoil nitro piston rifles.
Does the scope come with a mount?
Yes, it includes a one-piece mount with four clamping screws and a removable recoil stop pin.