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- Mirafit M4 Jammer Arms
- New and improved generation 2 design now features 10 adjustable starting positions
- Suitable for the Mirafit M4 Power Rack and Half Rack (rack must be bolted down)
- Attach to your power rack uprights to add a range of exercise options
- Ten starting position adjustments ensure optimal setup for every exercise and user height
- Stainless steel adjustment plate with laser cut numbers for easy setup changes
- Levers move independently, allowing for unilateral training
- Adds a wide range of fixed-path movements (presses, rows, squats) to your power rack, replacing multiple standalone machines
- Suitable for use with Olympic weight plates and bumper plates
- Heavy duty 75mm x 75mm x 3mm steel box section
- 32mm diameter handles
- Multi-angled handles allow variation in grip for targeting different muscles
- Handles with weight poles can also be removed if required
- Eyelets on the front of each arm can also be used for belt squats
- Also compatible with M4 resistance band pegs (available here)
- Integrated nylon pads and large rubber stoppers prevent damage to the rack and equipment
- Black power coated finish with stainless steel weight poles
- Supplied in pairs
- Includes securing pins
- Please note these jammer arms are only suitable for use with M4 models
- Net weight approx 56kg (28kg per handle)
- Measurements:
- Arm length: 108.5cm
- Weight pole length: 29cm
- Total width: 76cm
- Important: The rack must be bolted down securely before using the jammer arms
Mirafit M4 Jammer Arms
New Generation 2 M4 jammer arms now featuring 10 adjustable starting positions for improved setup and versatility. Adds presses, rows, squats and unilateral movements to your rack. Heavy-duty design with multi-grip handles.
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Features
Multi Angled Handles
Multiple angles on the handles allow for multiple grip options, including angled, pronated, neutral, and supinated.
Adjustable Start Position
10 different start positions mean you can set the jammer arms to the ideal angle for each exercise.
Eyelet
Each jammer arm features an eyelet. Connect it to an existing weight belt and chain to perform belt squats.
Reviews
(4.4) Based on 3 reviews
- 5 star reviews
- 67% (2)
- 4 star reviews
- 0% (0)
- 3 star reviews
- 33% (1)
- 2 star reviews
- 0% (0)
- 1 star reviews
- 0% (0)
Share your thoughts
If you've used this product, share your thoughts with other customers
Write a reviewTim
Jul 11, 2026
Treated myself to a pair of these and glad I did, the usual high quality from Mirafit.
Very solid and well built, these are great for getting a few more forced reps out on things like shoulder press.
They do take some fine tuning with positioning but once you find your own preference then you can’t go wrong.
Well worth the money.
Bob
May 31, 2025
Great piece of kit that requires some adjusting before you get it right. But once you have your positions on the rack sorted and where you want your bench, these things work a treat. I’ve found the most effective exercises are shoulder presses (either single or both), shrugs, rows, and deadlifts. You can really max out your shoulders and work on the negatives.
Simon
Jul 1, 2024
I really wanted to like these but they feel like a v1 product that hasn't really been thought through. On the plus side, they are extremely well built, which ironically is part of the problem.
The #1 flaw with them is no lockouts. Half the attraction was seated shoulder press, or chest press, but without any way to lock out the starting position, the already heavy arms are really too difficult to use for like this. I was able to work around this by using the arms facing inwards and having them catch on spotter arms mounted on the opposite posts, but it's a lot of setup/teardown time and interferes with other exercises.
I also got the utility platform and kinda rigged up a leg press but the force curve isn't right (although better with bands and pegs) and the holes strangely don't align very well. Getting it into position was also extremely difficult.
They're probably best for belt squats, but then you'd only need one, not a pair, and without a kickstand, they're not very usable either.
I'd really like to like them but overall the compromises mean they stay off the rack, gathering dust. If mirafit re-engineered the mounting to include lockouts and/or a trolley (like Vendetta, for example) that could be retro-fitted, I'd take a second look but for me at least, they're hard to recommend. A rare miss - everything else I have has been great.
Response from store
The design has now been improved and features 10 lockout positions.
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