What tool do I need to install the set screws?

Small Allen wrench which is come with the package

I want to buy this for friend he is kind lets us borrow his shotgun. this is model Winchester defender upc048702114090

I bought this for my Winchester SXP Marine Defender and it fits well. Although my Defender is a slightly different model than yours, the unit mounts to the top of the weapon via the standard factory accessory / optic mounting holes, so it should fit yours as well.

Will this fit an SX4?

If it has the four screws on top and doesn't interfere with the action then yes it should work.

Would this fit a stevens 320 defense 12ga.?

I can’t say, but it fit my Winchester perfectly.

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Monstrum Side Saddle Shell Holder Compatible with Winchester SXP Defender / 1300 Model Shotguns | 12 Gauge

Product ID: 477147304

🔫6-shell capacity

⚙️Picatinny/Weaver mount ready

🛠️No gunsmithing needed

€ 58.98

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔫 Reload faster, aim sharper, dominate every hunt.

EFFORTLESS INSTALLATION - Installs easily with included set screws—no gunsmithing required.
READY FOR RAPID RELOADS - Holds up to six 12 gauge shells for instant access on the field.
PRECISION OPTICS COMPATIBLE - Mount your favorite Picatinny or Weaver scopes and red dots seamlessly.
BUILT TO LAST WITH LIFETIME GUARANTEE - Crafted from durable aluminum and backed by Monstrum’s lifetime warranty.
TAILORED FIT FOR WINCHESTER SXP DEFENDER 1300 - Specifically engineered for perfect compatibility with your shotgun model.

The Monstrum Side Saddle Shell Holder is a precision-engineered aluminum accessory designed exclusively for 12 gauge Winchester SXP Defender and 1300 shotguns. It securely holds six shells and supports mounting of Picatinny or Weaver optics, installing easily with included hardware and backed by a lifetime guarantee for durability and reliability.

Specifications

ASIN	B0BGMW52VL
Best Sellers Rank	#110,405 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #323 in Hunting & Shooting Gun Stock Accessories
Brand Name	Monstrum
Customer Reviews	4.6 4.6 out of 5 stars (177)
Date First Available	September 27, 2022
Item Package Dimensions L x W x H	6.69 x 2.48 x 1.93 inches
Manufacturer	Monstrum
Material	Aluminum
Package Weight	0.19 kg
Part Number	RM241

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