is this site good for the left hand side for us southpaw shooters?

I would think that it would work fine if you flipped it around to extend from the left side. I would not shoot it on the right side of the gun left handed because brass would peg your face. But flipping them around to the other side should work fine. From an aiming standpoint its the same concept that applies

Will this fit my H&K 416-22?

as long as you have a picatiiny rail fits my ar15 and ar10

Can the front sight post be resplaced with one from Blitzkrieg? The ones that are high contrast and/or tritium insert?

These are a clone of the Dueck Defense RTS sights, which are standard military A2 sights. They use a standard AR-15 front sight post, so you should have no issue using aftermarket posts for the standard A2 front sight.

Is the index knob adjustable and does it have an index set screw?

It is but there is not a set screw

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Feyachi Flip Up Iron Sights 45 Degree High Transmittance Optical Fiber Front and Rear with Green/Red Dot for Picatinny Backup Sight

Product ID: 562472383

Details

Brand
Feyachi
Color
gray
Compatible Devices
Weaver
Item Weight
0.12 kg
Manufacturer
Feyachi
Material
Aluminum

🎯High transmittance fiber optic dots

🔆45° flip-up for versatile aiming

🛡️800G impact resistance, ultra-durable

Description

🎯 Elevate your aim, dominate every shot with Feyachi’s flip-up fiber optic sights!

BUILT TO ENDURE - Survives 500 impacts at 800G acceleration—reliability you can trust in any scenario
CRYSTAL CLEAR TARGETING - High transmittance polymer fiber optics deliver rapid target acquisition in all light conditions
FLIP FOCUS WITH PRECISION - 45-degree hinged flip-up design for seamless CQB to long-range transitions
CUSTOMIZABLE WINDAGE ADJUSTMENT - Side buttons and included hex key ensure perfect zeroing on Picatinny/Weaver rails
SLEEK LIGHTWEIGHT AND TACTICAL - Premium anodized aluminum alloy construction at just 0.12 kg for rugged portability

The Feyachi Flip Up Iron Sights feature a 45-degree hinged design with high transmittance fiber optic front and rear dots in green/red for rapid target acquisition. Engineered from anodized aluminum alloy, these sights withstand 500 impacts at 800G acceleration, ensuring durability and precision. Compatible with Picatinny and Weaver rails, they offer adjustable windage via side buttons and come with a hex key for easy installation. Lightweight at 0.12 kg, they are ideal for both close-quarters and long-range shooting scenarios.

Specifications

ASIN	B0CH9JJKMR
Best Sellers Rank	#564,057 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #74 in Handgun Scopes #803 in Airsoft Gun Sights
Brand Name	Feyachi
Color	gray
Compatible Devices	Weaver
Customer Reviews	4.3 4.3 out of 5 stars (126)
Item Weight	0.12 kg
Manufacturer	Feyachi
Material Type	Aluminum
Model Name	5054-p
Mounting Type	Weaver Mount
Number of Items	1
Product Style	Design
Reticle Type	Fiber Optic
Sport Type	Archery
UPC	766646249561

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