Description
Anyone who shoots off a rear bag knows the little details add up fast. The MDT Rear Bag Rider gives you an additional five inches of contact surface to settle your rifle on a bag and make those fine elevation adjustments that matter at distance. It attaches via M-LOK and bolts right onto compatible MDT buttstocks, turning a short factory underside into a long, stable platform you can really drive into a bag.
The shape is where this piece earns its keep. A flat, horizontal top surface keeps recoil moving in a straight line back into your shoulder, which helps you spot your own shots and stay on target. The front and side edges are rounded off so the rider glides across a bag rather than digging in or hanging up on your gear when you shift positions. The profile is kept slim to match the width of the buttstock, so nothing feels bulky or tacked on.
Why the MDT Bag Rider Earns a Spot on Your Stock
It is machined from 6061-T6 aluminum and wears a Mil-Spec Type II hard-black anodized finish, so it shrugs off the repeated abuse of range days and match weekends. At roughly 0.215 pounds it barely registers on the scale, which matters if you are already watching the weight of a loaded chassis build.
Fit and Compatibility of the MDT Rear Bag Rider
This rider is built around the M-LOK mounting system found on stocks like the MDT ESS and SRS V5 (and newer), and it also works with legacy buttstocks. One of the smarter design touches is that there is no rear overhang, so your length-of-pull and buttpad adjustments stay completely free to move. If you run an MDT chassis and lean on rear bag support for PRS, NRL, or long-range work off a bipod, this is a clean, purpose-built upgrade that just makes the stock do its job better.
Key Specifications
- Manufacturer: MDT
- Manufacturer Part Number: 103631BLK
- UPC: 990482718046
- Model: Rear Bag Rider
- Surface Length: 5 inches
- Material: 6061-T6 Aluminum
- Finish: Mil-Spec Type II Hard-Black Anodized
- Color: Black
- Mounting Interface: M-LOK (also fits legacy buttstocks)
- Weight: 0.215 lb
- Compatibility: MDT ESS and SRS V5 (and newer) buttstocks
- Firearm Type: Rifle
What’s Included
- MDT Rear Bag Rider (5" aluminum, M-LOK, black)
Frequently Asked Questions
What buttstocks does the MDT Rear Bag Rider fit?
It mounts through the M-LOK slots found on MDT buttstocks like the ESS and SRS V5 and newer. MDT also lists it as compatible with legacy buttstocks. Since it uses M-LOK, it will work with any buttstock that has compatible M-LOK mounting in the right spot on the underside.
How does the Rear Bag Rider help my shooting?
It adds five inches of flat, horizontal contact surface for your rear bag, which gives you a longer and more stable platform to settle the rifle. That extra length makes fine elevation changes easier and helps recoil track straight back into your shoulder. The result is a steadier hold and easier shot spotting on supported positions.
Will the bag rider interfere with my length-of-pull or buttpad adjustments?
No. MDT designed it with no rear overhang specifically so your length-of-pull and buttpad settings stay free to adjust. You can tune your fit without the rider getting in the way.
What is the MDT Rear Bag Rider made of?
This version is machined from 6061-T6 aluminum and finished with a Mil-Spec Type II hard-black anodized coating. That combination keeps it light at about 0.215 pounds while standing up to repeated use at the range and in matches.





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