Description
When you're relying on iron sights, you want something that holds zero and takes a beating without complaint. The Yankee Hill Machine YHM-9627 delivers exactly that with an all-steel build that shrugs off hard use and rough weather. It mounts on the same plane as your rear sight, which keeps your front and rear irons aligned the way they were meant to be, and it clamps onto any standard Picatinny rail using the included thumb screw. No armorer trip required, just snug it down and you're set.
What Makes the YHM-9627 a Solid Backup Sight
The whole point of a backup front sight is that it stays out of your way until you need it. Push the button and the YHM-9627 folds down flat, giving your red dot or magnified optic a clear, uncluttered sight line. When things go sideways, it flips up and locks positively in the deployed position so you're not fighting a wobbly sight when you need to make the shot. That folded profile takes up very little rail real estate too.
Fit and Compatibility of the Same Plane Flip Front Sight
This sight accepts all standard AR sight posts and hardware, and the necessary hardware comes in the box, so it plays nice with the M4/M16-pattern parts most folks already have on hand. It's built to co-witness with the standard M16-M4 front sight and pairs naturally with YHM's matching rear flip sight if you want a full front-and-rear iron setup. Elevation is set through the front post and windage gets dialed at the rear, which is the classic AR arrangement most people already know.
Built to Last
Steel construction is the real story here. Where a lot of budget flip sights lean on plastic, this one is machined to hold up over the long haul. It weighs in right around 2.5 ounces, so you get the durability of steel without loading down the front of your rifle. It's a no-nonsense piece of kit for anyone who wants dependable backup irons that just work.
Key Specifications
- Manufacturer: Yankee Hill Machine
- Model: Same Plane Flip Front Sight
- Manufacturer Part Number: YHM-9627
- UPC: 816701013498
- Color: Matte Black
- Material: All-Steel Construction
- Mount Type: Picatinny Rail
- Sight Type: Folding Backup Front Iron Sight
- Adjustment: Windage Adjustable, Accepts Standard AR Front Posts
- Weight: Approximately 2.5 oz
- Attachment: Included Thumb Screw
- Product Type: Accessory – Lasers and Sights
What’s Included
- Yankee Hill Machine Same Plane Flip Front Sight (YHM-9627)
- Thumb screw for mounting
- Standard AR front sight post and hardware
Frequently Asked Questions
Will the YHM-9627 flip front sight co-witness with a red dot?
Yes. It's designed to co-witness with the standard M16-M4 front sight height and all of YHM's front sights. When you're running a red dot, just fold it down flat and it clears the sight window until you need it.
What does this Same Plane Flip Front Sight mount to?
It clamps onto any standard Picatinny rail, whether that's your upper receiver rail or a rail section on the handguard. The included thumb screw makes it a quick install with no special tools. Just position it, snug it down, and confirm your zero.
Is the YHM-9627 made of steel or plastic?
This is an all-steel sight, which is a big part of the appeal. Steel holds up to hard use and rough conditions far better than the polymer flip sights you'll find at a similar price point. Users consistently point to the strong build and clean fit and finish.
How do I adjust the sights once it's mounted?
It accepts all standard AR sight posts and hardware, so elevation is set at the front post just like a standard AR front sight. Windage is dialed at your rear sight. Pairing it with a matching YHM rear flip sight gives you a complete, easy-to-tune iron sight setup.






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