What can be done if the front sight moves side-to-side?

The front sight comes with a short screw, and a screw that's a tad bit longer. I also have a gen4 g19. I tried the longer screw first and it bottomed out, so I had to use the shorter (correct) screw and everything tightened up just fine. No side to side movement so, not sure why you're having problems since we both have the same exact gun, same exact sights. Maybe you didn't notice that this sight comes with 2 different length screws for the front sight??

are these night sights

Yes they glow green at night just as bright green as the fiberoptics do during the day. The night sights are placed in the back of the green fiberoptics. you will be surprised at the brightness of this sight day and night. I Love Mine and would not trade them for any other sight.

It states that there is a black option and a green option for these sights. What does it mean by Black sights?

Rear sight will be black , front will still have tritium sight.

Can I install it on my G21 and G22 gen4 without any modification?

The Glock G21 is a large frame gun and the G22 is a small frame Glock pistol, The G21 has a slightly wider slide and longer magazine well to accomidate the longer 10mm & 45acp cartridges, but the dovetail in the slide and the slot for the front sight are identical allowing the small frame and large frame Gen 1 through Gen 4 Glocks to share common sights. The current Glock rear sight tool will change sights on all small and large receiver (frame) guns as will the front sight tool. I have changed sights on both small and large frame Glocks.

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Description

🌟 Elevate your Glock game with sights that never sleep.

UNMATCHED NIGHT VISIBILITY - Patented TFO tech delivers bright, battery-free sight picture anytime, anywhere.
PRECISION ENGINEERED FOR GLOCK - Custom fit for Glock models 17, 19, 22, 26, 34, 45 & more — no compromises on accuracy.
STEALTH OPTIMIZED FIBER OPTICS - Concealed fiber-optic rods gather light without alerting your target.
HOLSTER FRIENDLY SNAG RESISTANCE - Smooth profile fits standard kydex and fabric holsters for seamless carry.
RUGGED DURABILITY MEETS SLEEK DESIGN - CNC-machined alloy steel with Nitride Fortress finish resists wear and snagging.

The TRUGLO TFO Tritium & Fiber-Optic Handgun Sight is a precision-engineered, snag-resistant sight system designed exclusively for Glock pistols. Featuring patented TFO technology, it offers continuous bright visibility without batteries by combining tritium and fiber-optic elements. Crafted from CNC-machined alloy steel with a durable Nitride Fortress finish, it ensures rugged reliability and smooth holster compatibility, making it the ultimate upgrade for professional shooters seeking enhanced accuracy and stealth in all lighting conditions.

Specifications

Brand	TRUGLO
Color	Green
Style	Glock Low Set
Sport	Airsoft, Hunting
Item Weight	22.68 g
Material	Alloy Steel
Magnification Minimum	1 x
Compatible Devices	Handgun
Mounting Type	Rail Mount
Night vision	Yes
Model Name	TFO Tritium and Fiber-Optic Handgun Sights for Glock Pistols
Manufacturer	TruGlo
UPC	788130080764
Global Trade Identification Number	00788130080764
Item Package Dimensions L x W x H	6.1 x 5.28 x 1.46 inches
Package Weight	0.04 Kilograms
Item Dimensions LxWxH	1 x 1 x 1 inches
Brand Name	TRUGLO
Country of Origin	United States
Warranty Description	Limited
Suggested Users	unisex-adult
Number of Items	1
Part Number	TG131GT1
Included Components	Sights
Size	One Size
Hand Orientation	Ambidextrous

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