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Questions & Answers
Do these work for the MDT LSS-XL 300WM long action chassis? If not which magazines do? Manufacturer Answer

Yes, the 300WM magazine will work in the LSS-XL long action versions of that chassis, but which of the 3 sizes you choose will depend on the rifle you have. Tikka builds and Savage Axis builds will need the 3.560 version, and all others will use the 3.715 or 3.850. There are too many versions to list here that use the larger size, so please reach out to the MDT support line so we can help you make the correct purchase from Optics Planet.

by MDT Sporting Goods, Manufacturer, May 27, 2026
Will this work for 257 Weatherby Mag? Manufacturer Answer

You will need the correct length to match what your rifle needs, but yes, the 300 WM version works with 257 Weatherby Magnum.

by MDT Sporting Goods, Manufacturer, August 15, 2025
Customer Reviews
Helpful Positive Review
Well made - Quality Product by PJW, Verified Owner, February 25, 2021
I bought a couple of these mags for my Bergara B-14 HMR in 300 PRC. These mags are listed as "300 Win Mag" but I can confirm that they fit 300 PRC. I'm running long 220gr Berger LRHT bullets seated at the length I want them and these mags are large...
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2/2 found this helpful
Most Recent Reviews
Works great! by SPIKE, Verified Owner, June 12, 2026
Fit is grear, but a little bit of a rattle. Feeds great, can fit 6 rounds but then first round feeds harder!
Most Recent Reviews
This fits just right in my Outlier 7mm Rem Mag build. Feeds a little stiff but seemed to loosen up a little as I shot the firearm! I could fit 6 rounds into it but then the first round fed hard! Will be ordering another soon!
Most Recent Reviews
Works for my 300wm in a field stock by clint, Verified Owner, May 15, 2026
Works for my 300wm in a field stock. It a little snug but it actually holds 6 rnds which is a bonus in my opinion.
Most Recent Reviews
Excellent and Durable by Rich, Verified Owner, November 13, 2025
Works well for 6.5 PRC, just needs a slight lip adjustment
Most Recent Reviews
MDT AICS magazine by Coyote hunter, Verified Owner, October 27, 2025
Does what it is intended for. I am using a .300 win mag magazine for 7 PRC. You need to adjust the lips and the feed angle for them to work. It would be better if MDT designed a dedicated 7 PRC mag and had options for a 3 round version.
Read All 10 Reviews
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Certain firearm magazines and extensions are subject to maximum capacity restrictions based on state and local laws. Currently, we are unable to sell these products to some locations. For a complete list of these restrictions, please visit our policy page.

By continuing with your purchase, you agree to adhere to all applicable laws and regulations.  

Product Info for MDT Long Action Metal Magazine

MDT metal AICS Rifle Magazines are manufactured from high strength steel and finished with Cerakote Elite for the ultimate in durability and corrosion resistance.image

The magazines are offered in .300 Winchester Magnum and .338 Lapua Magnum configurations and are compatible with AICS pattern DBM chassis and bottom metals

The 300 Win Mag magazine can also be used for 7mm Rem Mag, 30.06, 6.5x55 and similar cartridges by adjusting the feed lips.

The magazines are manufactured in multiple lengths.

3.715" 300 WM and 338 LM for our chassis systems and other DBM

for the different lengths, 3.560" 300WM for our chassis systems for Tikka long action rifles (270 Win, 30-06, 300 WM etc)

3.850" 300 WM and 338 LM for CIP spec chassis and DBM

Specifications for MDT Long Action Metal Magazine:

Manufacturer: MDT
Color: Black
Fabric/Material: High strength steel with Cerakote Elite finish
Magazine Capacity: 5 Round
Quantity: 1
Condition: New
Country of Origin: Canada

Features of MDT Long Action Metal Magazine:

  • All our chassis are manufacturered with a 3.715" magazine well with the exception of Tikka T3T3x and Savage Axis which take 3.560" and a couple ESS which say they take CIP length which are 3.850"
  • - If however you purchased a rifle direct from an OEM or retailer
  • please check the specifications.
  • - The Remington Tactical Chassis Rifle and 338 Lapua XCR rifles use a 3.775" magazine not available from MDT
  • - Tikka T3 long action calibers in our chassis you must use the 3.560" option.
  • - Will not work with 300 Remington Ultra Mag
  • 300 Weatherby
  • and similar cartridges.

Package Contents:

  • MDT Long Action Metal Magazine

MDT Long Action Metal Magazine Orderable Models

List of Orderable Models

  • MDT Metal Magazine, Long Action, 3.85 inch, .338 LM, 5-Round, Black, 102089-BLK , MPN: 102089-BLK , UPC: 723905910808 , Code: 3JN-RM-MMLA-102089-BLK-5RD
  • MDT Metal Magazine, Long Action, 3.56 inch for Tikka T3/T3x and Savage Axis LA Chassis, .300WM, 5-Round, Black, 102142-BLK , MPN: 102142-BLK , UPC: 723905908737 , Code: 3JN-RM-MMLA-102142-BLK-5RD
  • MDT Metal Magazine, Long Action, 3.715 inch, .300WM, 5-Round, Black, 102143-BLK , MPN: 102143-BLK , UPC: 723905908713 , Code: 3JN-RM-MMLA-102143-BLK-5RD
  • MDT Metal Magazine, Long Action, 3.56 inch for Tikka T3/T3x and Savage Axis LA chassis, .30-06, 5-Round, Black, 103208-BLK , MPN: 103208-BLK , UPC: 709951102817 , Code: 3JN-RM-MMLA-103208-BLK-5RD
  • MDT Metal Magazine, Long Action, 3.715 inch, .338 LM, 5-Round, Black, 102144-BLK , MPN: 102144-BLK , UPC: 723905908720 , Code: 3JN-RM-MMLA-102144-BLK-5RD
  • MDT Metal Magazine, Long Action, 3.85 inch, .300WM, 5-Round, Black, 102088-BLK , MPN: 102088-BLK , UPC: 723905910792 , Code: 3JN-RM-MMLA-102088-BLK-5RD

MDT Long Action Metal Magazine Unavailable & Discontinued Models

List of Unorderable Models

  • USED, MDT Metal Magazine, Long Action, 3.85 inch, .300WM, 5-Round, Black, 102088-BLK , MPN: 102088-BLK-EDEMO , Code: 3JN-RM-MMLA-102088-BLK-5RD-EDEMO-OB-C
  • USED MDT Metal Magazine, Long Action, 3.715 inch, .338 LM, 5-Round, Black, 102144-BLK, EDEMO1, Used, Condition Like New , MPN: 102144-BLK-EDEMO1 , Code: 3JN-RM-MMLA-102144-BLK-5RD-EDEMO1
  • USED MDT Metal Magazine, Long Action, 3.715 inch, .300WM, 5-Round, Black, 102143-BLK, EDEMO2, Used, Condition Like New , MPN: 102143-BLK-EDEMO2 , Code: 3JN-RM-MMLA-102143-BLK-5RD-EDEMO2
  • USED, MDT Metal Magazine, Long Action, 3.715 inch, .300WM, 5-Round, Black, 102143-BLK , MPN: 102143-BLK-EDEMO , Code: 3JN-RM-MMLA-102143-BLK-5RD-EDEMO-IN-D
  • USED MDT Metal Magazine, Long Action, 3.56 inch for Tikka T3/T3x and Savage Axis LA chassis, .30-06, 5-Round, Black, 103208-BLK, EDEMO3, Used, Condition Like New , MPN: 103208-BLK-EDEMO3 , Code: 3JN-RM-MMLA-103208-BLK-5RD-EDEMO3
  • USED MDT Metal Magazine, Long Action, 3.56 inch for Tikka T3/T3x and Savage Axis LA chassis, .30-06, 5-Round, Black, 103208-BLK, EDEMO2, Used, Condition Fair , MPN: 103208-BLK-EDEMO2 , Code: 3JN-RM-MMLA-103208-BLK-5RD-EDEMO2
  • USED, MDT Metal Magazine, Long Action, 3.85 inch, .300WM, 5-Round, Black, 102088-BLK , MPN: 102088-BLK-EDEMO , Code: 3JN-RM-MMLA-102088-BLK-5RD-EDEMO-RE-B
  • Open Box, Dealer Demo, MDT Metal Magazine, Long Action, 4.05 inch, .338 LM, 5-Round, Black, 102147-BLK , MPN: 102147-BLK-DMO , Code: 3JN-RM-MMLA-102147-BLK-5RD-DMO-OB-A
  • MDT Metal Magazine, Long Action, 4.05 inch, .338 LM, 5-Round, Black, 102147-BLK , MPN: 102147-BLK , UPC: 709951107348 , Code: 3JN-RM-MMLA-102147-BLK-5RD
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