Will this fit a rock island core arms mervia?

No. This was designed for a Remington 870 or 1187.

Will this fit a stoeger p3000 home defense?

Yes, the Monstrum shell holder will fit.

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Monstrum Side Mounted 12 Gauge Shotgun Shell Holder with Picatinny Rail Mount for Drilled and Tapped Remington 870 Model Receivers

Monstrum Side Mounted 12 Gauge Shotgun Shell Holder with Picatinny Rail Mount for Drilled and Tapped Remington 870 Model Receivers

Product ID: 209892244

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💪Durable aluminum

📏Compact design

🔧Easy installation

Description

🔫 Gear Up for Action!

QUICK ACCESS TO AMMO - Holds up to six 12 gauge shells for rapid reloads.
LIGHTWEIGHT YET STURDY - Weighs only 0.19 kg, built to withstand the toughest conditions.
ELEVATE YOUR SHOTGUN GAME - Transform your Remington 870 into a tactical powerhouse.
VERSATILE OPTICS MOUNTING - Compatible with Picatinny and Weaver scopes for enhanced accuracy.
PROFESSIONAL INSTALLATION RECOMMENDED - Ensure optimal performance with expert setup.

The Monstrum Side Mounted 12 Gauge Shotgun Shell Holder is a dual-purpose accessory designed for Remington 870 Express Tactical shotguns. It securely holds up to six 12 gauge shells while providing a Picatinny rail for mounting optics. Crafted from durable aluminum, this lightweight holder enhances your shotgun's functionality and performance.

Specifications

Item Package Dimensions L x W x H	6.85 x 2.48 x 1.89 inches
Package Weight	0.19 Kilograms
Brand Name	Monstrum
Material	Aluminum
Manufacturer	Monstrum
Part Number	Z86

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