Riot MRR 75 | Jammer Arms + Multi-Grip Handles
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Trolley-mounted Jammer Arms built for the 75mm Riot MRR (Modular Rack Range) and Riot MRR Rig, engineered for rotational, unilateral and plate-loaded pressing work directly on your rack. This set pairs the height- and angle-adjustable Jammer Arms with Multi-Grip Handles and Weight Loading Pins, giving you a fully configurable station without giving up rack space for barbell work.
Height, Angle & Configuration
Each arm rides on a trolley that slides along the upright and adjusts in height via a mag pin - no tools needed. A second mag pin locks the arm into one of 13 angle positions, so you can dial in an exact start/stop angle and it stays locked mid-set.
Stoppers mount to the uprights independently of the arms and hold your handle configuration in place during use. Because the trolley sits on the outer face of the upright, it doesn't block the J-hook holes underneath - you (or a training partner) can still rack a barbell and squat on the same upright on the inside of the rack while the Jammer Arms are fitted.
Multi-Grip Handles & Weight Loading Pins
The included Multi-Grip Handles attach via a 2x mag pin quick-release and give you a choice of grip positions for pressing movements and deadlift variations.
The Weight Loading Pins use the same mag pin attachment and let you load weight plates directly onto the arms (up to 250kg per pin) - turning the Jammer Arms into a plate-loaded press station for progressive overload on presses and much more.
Construction & Compatibility
Arms are built from 75 x 75 x 3mm steel tube, finished in black powder coat for durability. Built specifically for the Riot MRR and Riot MRR Rig 75mm upright system.
Fitting the trolleys requires partially disassembling an already-built rack so each trolley can be slid over the top of the upright.
Safety Note
Always confirm both mag pins are fully engaged before loading or pressing, and don't exceed the 250kg rated load per Weight Loading Pin.
Exercises You Can Do
The classic jammer press, standing and seated chest press, shoulder press, single-arm press for unilateral strength and core stability, single-arm rows, and explosive push press throws or Viking-press-style pressing for power development - plus, once the Weight Loading Pins are fitted, all of the above loaded progressively with plates.
Add the separately available Straight Bar Handle, ISO Bar Handles or Landmine Handle to unlock further variations - the Straight Bar Handle alone opens up additional press and grip variations.
Key Highlights
- Height-adjustable trolley mount via mag pin - no tools needed to reposition
- 13-position angle lock via mag pin for a dialled-in start/stop angle
- Independent stoppers keep your handle configuration fixed during use
- Doesn't block J-hooks - the rack stays usable for barbell work at the same time
- Multi-Grip Handles
- Weight Loading Pins rated to 250kg per pin for plate-loaded pressing
- Built from 75 x 75 x 3mm powder-coated steel tube
- Compatible with the Riot MRR & Riot MRR Rig
Specifications
| Spec Detail | Specification |
| Included | Jammer Arms + Trolleys + Stoppers (pair), Multi-Grip Handles (pair), Weight Loading Pins (pair) |
| Material | Black powder-coated steel |
| Arm tube profile | 75 x 75 x 3mm |
| Arm rail length | 1327.9mm |
| Arm horizontal reach | 375mm |
| Angle adjustment | 13 positions, mag pin lock |
| Height adjustment | Mag pin trolley, tool-free |
| Multi-Grip Handle frame | 369 x 300mm, Ø17mm mounting bar, 70° grip angle |
| Weight Loading Pins - max load | 250kg per pin |
| Weight (approx.) | Jammer Arms + Trolleys + Stoppers ~17kg · Multi-Grip Handles ~10kg · Weight Loading Pins ~6kg |
| Compatibility | Riot MRR, Riot MRR Rig (75mm upright system) |
FAQ
Q: What racks does this fit?
A: The Riot MRR and Riot MRR Rig 75mm upright system only.
Q: Do I need to fully disassemble my rack to install it?
A: No - only partial disassembly, so the trolley can be slid over the top of the upright.
Q: Can I still use J-hooks on the same upright while the Jammer Arms are fitted?
A: Yes. The trolley sits on the outer face of the upright, so it doesn't block the J-hook holes on the inside - you can still rack a barbell and squat on the same upright.
Q: How do I adjust the angle?
A: A mag pin locks the arm into one of 13 angle positions, so you can set an exact start/stop angle without tools.
Q: What's included in this set?
A: A pair of Jammer Arms with trolleys and stoppers, a pair of Multi-Grip Handles, and a pair of Weight Loading Pins.
Q: Can I add more attachments later?
A: Yes - the Straight Bar Handle, ISO Bar Handles and Landmine Handle are available separately and attach the same way, each unlocking further press and grip variations.
