Image unavailable
#40 Stand Alone Flip-Up Rear Sight - #40 Stand Alone Flip-Up Rear Sight Black
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$179.99
View on Brownells
You'll be taken to Brownells to complete your purchase.
Hunter's Outpost earns a commission from affiliate links at no extra cost to you.
SKU: 430117368
Overview
Built as a stand-alone flip-up rear sight, this A.R.M.S. Inc. option is intended for shooters who want a backup sighting solution that stays secured until needed. Its spring-loaded design is described as providing constant in-battery action and repeat zero, while the quick-release lever is meant to keep the sight locked down against accidental engagement. The horizon line notch and 500–600 meter sight picture make it suited to practical field or range use, and the rearward lean is designed to fold in the correct direction if dropped. Windage adjustments are listed at .75 MOA, giving it a straightforward, purpose-driven setup for serious use.
Why Hunters Choose the A.R.M.S.,Inc
Spring-loaded Design
Supports constant in-battery action and
Quick-release Lever
Keeps the sight locked down
Can Be
Released quickly, even while wearing
Includes Horizon
500-600 meter sighting reference
Windage Adjustments
Are specified at .75 MOA
Key Features
- Stand-alone flip-up rear sight from A.R.M.S. Inc.
- Spring-loaded design is intended to return to battery and repeat zero.
- Quick-release lever locks the sight down to help prevent accidental engagement.
- Rearward-leaning fold direction is designed to protect the sight if dropped.
- Includes a horizon line notch and 500-600 meter sighting reference.
- Windage adjustments are specified at .75 MOA.
Best Used For
- Hunters needing a stand-alone flip-up rear sight for a rifle setup with backup irons
- Users who want a spring-loaded rear sight designed for repeat zero after deployment
- Field shooters working in cold conditions who may need quick release use with mittens
- Hunters wanting a rear sight with a 500–600 meter sighting reference and windage adjustment
- Shooters prioritizing a locked-down folded position to reduce accidental engagement
Specifications
| Color | Black |
|---|---|
| Fold Direction | Rearward |
| Horizon Line Notch | Yes |
| Quick Release Lever | Yes |
| Sight Range | 500-600 meter |
| Sight Type | Stand Alone Flip-Up Rear Sight |
| Spring Loaded | Yes |
| Windage Adjustment | 0.75 MOA |
Pros
- Spring-loaded design supports constant in-battery action and repeat zero.
- Quick-release lever keeps the sight locked down until intentionally deployed.
- Can be released quickly, even while wearing arctic mittens.
- Includes a horizon line notch with 500-600 meter sighting reference.
- Windage adjustments are specified at .75 MOA.
- Rearward-leaning fold direction is designed to protect the sight if dropped.
Considerations & Trade-offs
- Designed as a dedicated rear sight, so it is not a complete sighting solution on its own and must be paired with the rest of the setup you intend to run.
- The quick-release, spring-loaded design is built for fast deployment, but that also means it adds a mechanical component that should be checked and kept clear of debris before use.
- Windage adjustment is specified at .75 MOA, which provides adjustment capability but may feel limited for users wanting finer incremental changes.
- The 500–600 meter sighting reference and horizon line notch are specific to this model, so it is best suited to shooters who want that particular rear-sight configuration rather than a more general-purpose option.
Suggested Comparisons
- Flip-up rear sights
- Back-up iron sights
- AR-15 sighting accessories
Suggested Accessories
- Flip-up front sight
- Optic mounting rail
- Sight adjustment tool
- Protective lens cover
Frequently Asked Questions
What is the A.R.M.S. #40 Stand Alone Flip-Up Rear Sight designed to do?
It is a stand-alone flip-up rear sight intended to provide a rear sighting option with a spring-loaded design and a quick-release locking lever.
Does the sight stay locked down when not in use?
Yes. The description says it is held in the locked-down position by a quick-release lever that helps prevent accidental engagement.
What kind of adjustments does this rear sight offer?
The listed windage adjustment is .75 MOA.
What sighting features are mentioned for longer-range use?
The product description says it has a horizon line notch and a 500-600 meter sight.
Is this sight meant to fold in a specific direction if dropped?
Yes. The description says it leans to the rear so it folds in the correct direction if dropped.