US Automatic Sentry 300
#8 in Single swingFull review
A commercial grade, UL 325 listed single gate opener with a long warranty for buyers who value proven parts support over capacity per dollar.
Amazon $1,395$1,395
The US Automatic Sentry 300 is the better automatic gate opener overall, rated 3.2 to 2.9. The US Automatic Sentry 300 leads on warranty and gate length. The TOPENS A5131 wins on price and gate weight. The TOPENS A5131 costs $1,066 less ($329 vs $1,395).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
TOPENS A5131
#12 in Single swingFull review
A low cost single gate kit for a light or medium driveway gate near the house, where a safety listing is not required.
Amazon $329$329
Which should you buy?
- Choose the US Automatic Sentry 300 for warranty (3-year warranty vs 1-year warranty) and gate length (gates up to 20 ft per leaf vs gates up to 16 ft per leaf).
- Choose the TOPENS A5131 for price ($329 vs $1,395) and gate weight (gates up to 550 lb per leaf vs gates up to 400 lb per leaf).
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 | US Automatic Sentry 300 | TOPENS A5131 |
|---|---|---|
| Overall rating | 3.2/5 | 2.9/5 |
| Gate weight 20% | 24 gates up to 400 lb per leaf | 50 gates up to 550 lb per leaf |
| Gate length 15% | 100 gates up to 20 ft per leaf | 60 gates up to 16 ft per leaf |
| Safety listing 15% | 100 UL 325 listed | 0 no UL 325 listing published, scored as none |
| Price 25% | 0 $1,395 | 79 $329 |
| Warranty 25% | 50 3-year warranty | 0 1-year warranty |
Specifications
| US Automatic Sentry 300 | TOPENS A5131 | |
|---|---|---|
| Gate | ||
| Gate type | Single swing | Single swing |
| Heaviest gate | 400 lb | 550 lb |
| Longest gate | 20 ft | 16 ft |
| Time to open | 16 s | 15 s |
| UL 325 listed | Yes | - |
| Power | ||
| Power | Battery, solar ready | Battery, solar ready |
| Motor voltage | 12 V | 24 V |
| Build | ||
| Remotes included | 2 | 2 |
| Weight | - | 23.4 lb |
| Warranty | 3 years | 1 year |