S&J Hardware
Mossberg 590 Series Magazine Extension
8 Reviews
$54.59
Tax
In stock
- Stocked deep
- Fast dispatch
- Fitment verified
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Will fit Mossberg 590, 535, and 835 shotguns. Not compatible with the Mossberg Shockwave; it will fit, but won't allow for an extra round.
CNC machined from 4140 steel.
Finished product will be Cerakoted in the following colours:
- Graphite Black
- Flat Dark Earth
- OD Green
- Patriot Brown
- Silver (Best match for electroless nickel)
Comes with:
- 3 Position Sling Plate
- C Clip (to install sling plate)
- 1 Million Cycle Magazine Tube Spring
- No Jam Follower - Type 3
Overall length:
- +1 - 2.25 inches
- +2 - 4.5 inches and is designed for pre-2017 590/590a1 or 835
Made in Canada.
Compatibility: *Likely not compatible with any clamp designed for use with a tube made of aluminum, or having a plastic sleeve covering. These tubes tend to be a little thicker in diameter.
| License Required | Non-Restricted |
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Great product
Nice finish, works as described. Came with enough spring to do two mag tubes on my 590r. It holds 7+1 now and the tube is even with the barrel. Serrated nut fits securely with the factory detent pin -
Excellent.
Im in the UK, so our 590 can only have 24” or longer barrels. This +2 extension fits flush with the 24” barrel, a perfect fit, and so far has function flawlessly with the original spring. Also quick thank you to SJ for super fast delivery to the UK, mossberg bits are surprisingly hard/expensive to get hold of over here! -
Fits Great!
This fits good for my 590 Mossberg. Fun shooting an additional shell. Took me a bit to understand how long the new spring should be. -
Excellent product
Fit and finish is perfect! I used the one round extension on a mossberg 590 breacher and it cleared no problem. -
Mossberg 590 mag tube mk II plus 1
Excellent bit of kit. Arrived in UK within 10 days of placing order. Fits perfectly on my Mossberg Mariner and adds that extra 1 round capacity that is needed in IPSC competition. Major benefit is that it is a single piece, where other extensions comprise a nut and a tube and possibly an end cap as well (so three threads that might unscrew in use, where the S&J only has what amounts to a replacement factory end cap that includes a built in extension, so it stays put once attached. No barrel clamp needed). I would recommend it. -
Mossberg 835 UltiMag
Excellent product! Thankfully my Canadian brothers to the north have the part I needed. Thank you ! -
Mag Tube + 1 Extension - Mossberg 590
Quick shipping, Excellent quality, Looks fantastic. Only tested with snap caps so far but everything seems to be working great and I love the HiViz follower. Very happy with this purchase and service from S & J Hardware. Will definitely be purchasing from them again. -
Mossberg plus 1 extension
No complaints. Quality feels excellent, installation was a breeze. Haven't had the gun to the range yet, and won't get the chance for a while, but feels nice and snug. Recommended.
Pairs well with
