TOPENS A8131
#4 in Single swingFull review
A low cost opener for a heavy single gate near an outlet. Pick a UL 325 listed kit instead where the gate faces a public road or children.
Amazon $359$359
The TOPENS A8131 is the better automatic gate opener overall, rated 3.2 to 3.0. The TOPENS A8131 leads on gate weight and gate length. The Mighty Mule MM271 wins on price. The Mighty Mule MM271 costs $96.01 less ($262.99 vs $359).
Mighty Mule MM271
#7 in Single swingFull review
A budget, UL 325 listed kit for a short, light single gate. Anything over 12 ft or 300 lb needs the MM371W or larger.
Amazon $262.99$262.99
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the TOPENS A8131 for gate weight (gates up to 880 lb per leaf vs gates up to 300 lb per leaf) and gate length (gates up to 18 ft per leaf vs gates up to 12 ft per leaf).
- Choose the Mighty Mule MM271 for price ($262.99 vs $359).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every single swing automatic gate opener; a clear win is highlighted. How we rank explains each one.
| Factor weight | TOPENS A8131 | Mighty Mule MM271 |
|---|---|---|
| Overall rating | 3.2/5 | 3.0/5 |
| Gate weight 20% | 89 gates up to 880 lb per leaf | 0 gates up to 300 lb per leaf |
| Gate length 15% | 80 gates up to 18 ft per leaf | 20 gates up to 12 ft per leaf |
| Safety listing 15% | 0 no UL 325 listing published, scored as none | 100 UL 325 listed |
| Price 25% | 72 $359 | 96 $262.99 |
| Warranty 25% | 0 1-year warranty | 0 1-year warranty |
Specifications
| TOPENS A8131 | Mighty Mule MM271 | |
|---|---|---|
| Gate | ||
| Gate type | Single swing | Single swing |
| Heaviest gate | 880 lb | 300 lb |
| Longest gate | 18 ft | 12 ft |
| Time to open | 15 s | 18 s |
| UL 325 listed | - | Yes |
| Power | ||
| Power | Battery, solar ready | Battery, solar ready |
| Motor voltage | 24 V | 12 V |
| Build | ||
| Remotes included | 2 | 1 |
| Weight | 24.5 lb | 16 lb |
| Warranty | 1 year | 1 year |