Description
Slinging up a Mossberg 590 or 835 shouldn't mean drilling into your shotgun or living with an off-center hole in the mag cap. This Uncle Mike's set solves that with a replacement magazine cap that already has the swivel base built into it. You unscrew the factory cap, thread this one on in its place, and the front attachment point is done. No modifications to the receiver or barrel, nothing permanent, and if you ever want to go back to stock you just swap the cap again.
What Comes in the Mossberg 590/835 Swivel Kit
The set is built around 12 gauge Mossberg 590 and 835 pump guns and uses a 1-inch loop size. Up front is the integrated swivel-base magazine cap. For the rear, you get a 3/4-inch wood screw buttstock base that threads into the stock. Two QD Super Swivels with the Tri-Lock design round it out, giving you quick-detach clips on both ends so you can pull the sling off in a hurry when you need to. Everything is steel with a blued finish, which keeps the look consistent with a factory Mossberg and holds up to real field use.
Installing the Uncle Mike's Cap Swivel Set
Installation is about as simple as gun work gets. The mag cap is a straight swap with hand tools, and the buttstock base is a wood screw that snugs into the stock. Owners regularly describe the fit as clean and factory-looking once it's on, with the Super Swivels locking in securely enough that a loaded gun feels safe on the sling. It's a favorite for tactical and home-defense 590 builds as well as the 835 Ulti-Mag hunters run in the field.
One thing worth knowing before you order: this kit is spec'd for the standard 590 and 835. The 590A1 and some 590 Tactical variants use a different mag cap setup, so double-check your cap before buying if you're running one of those models.
Key Specifications
- Manufacturer: Uncle Mike's
- Manufacturer Part Number: 18112
- UPC: 043699181124
- Product Type: Mag Cap Swivel Set
- Fits: Mossberg 590 and 835, 12 Gauge
- Loop Size: 1 inch
- Buttstock Base: 3/4 inch wood screw
- Swivel Style: Quick Detach Super Swivel with Tri-Lock
- Material: Steel
- Finish: Blued
- Color: Blued
- Shipping Weight: 0.2 lbs
What’s Included
- Replacement magazine cap with integrated swivel base
- 3/4-inch wood screw buttstock swivel base
- Two 1-inch QD Super Swivels with Tri-Lock
Frequently Asked Questions
Do I have to drill or modify my shotgun to install this swivel set?
No drilling needed on the front end. The magazine cap already has the swivel base built into it, so you just unscrew your factory cap and thread this one on in its place. The rear buttstock base is a wood screw that snugs into the stock, so the whole install is straightforward with basic hand tools.
Will this Uncle Mike's set fit my Mossberg 590A1 or 590 Tactical?
This kit is spec'd for the standard Mossberg 590 and 835 in 12 gauge. The 590A1 and some 590 Tactical variants use a different magazine cap arrangement, so it may not be a direct fit on those. Check your existing mag cap against the standard 590/835 setup before ordering if you're running one of those models.
What size sling does this work with?
It uses a 1-inch loop size, so it's made for standard 1-inch slings. The two included Super Swivels are quick-detach with a Tri-Lock design, letting you clip the sling on or pull it off in seconds on both ends.
Is the finish going to match my Mossberg?
The hardware is steel with a blued finish, which blends in well with a stock Mossberg 590 or 835. Owners often mention that once it's installed it looks like it came from the factory rather than an add-on.





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