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Description
MAXX CNC Aluminum Hopup Chamber M4i - PROProduct Description CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on ICS CXP CS4 EBB (include old models) M4 M16 AEG series. The Hopup Chamber M4i unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments, the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R Hop and Standard Hop to keep the BB shooting
Product Description
CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on ICS CXP/CS4/EBB (include old models) M4/M16 AEG series.
The Hopup Chamber M4i unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments, the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot.
The Hopup Chamber M4i unit is designed to accept 21.00mm to 21.25mm nozzle length, and fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use.
The Hopup Chamber M4i unit is wisely equipped with an interchangeable Inlet Adaptor OD12mm to ensure the hopup unit is inserted exactly in the center of the 12mm inner bore ICS AEG Gearbox nozzle outlet without wobbling. (Inlet Adaptor OD11mm and OD11.5mm are optional)
Also mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots, and included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting.
More than that, the Hopup Chamber M4i Pro unit is specially designed with a new BB Latching System to prevent BB dropping after removing the magazine. The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber.
***The Dual UV LED Tracer Module is an add-on option to glow BB in the dark. Operating Voltage from 7VDC - 15VDC (2-4 cells LiPo, 6-13 cells NiCad). (Sold separately)
***Test results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS!
| Includes | |
| 1 x CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit | |
| 2 x CNC Acrylic Side Cover | |
| 2 x CNC Brass 2.9mm Side Wing | |
| 1 x CNC Steel Pivot Pin | |
| 1 x CNC Aluminum Hopup Lever | |
| 1 x CNC Aluminum Soft Round Nub | |
| 1 x CNC Aluminum Soft Flat Nub (4mm) | |
| 1 x CNC Aluminum Hard Concave Nub (4mm) | |
| 3 x Steel Nub Spring | |
| 1 x CNC Steel Spring Guide | |
| 1 x Steel Upper Compression Spring | |
| 1 x Steel Center Compression Spring | |
| 1 x CNC Delrin Locking C-Clip | |
| 1 x CNC Brass Barrel Spacer | |
| 1 x Brass Barrel Spacer Holder Oring | |
| 1 x CNC Aluminum Rotary Dial Knob | |
| 1 x CNC Aluminum Inlet Adaptor (OD12mm) | |
| 1 x CNC Brass Inlet Spacer |
| Specification |
| Overall Length: 51.65mm | |
| Overall Height: 38.75mm | |
| Inlet Adaptor Outer Diameter (to fit into Gear Box): 12mm | |
| Hub Outer Diameter (to fit into Outer Barrel): 12mm | |
| Hub Inner Diameter (to fit Nozzle): 8mm | |
| Feeder Outer Diameter (to fit magazine): 8.85mm | |
| Feeder Length (to fit magazine): 6mm | |
| Material: Aluminum 6061 |
| Features | |
| Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability | |
| Performed accurately and consistently on ICS CXP/CS4/EBB (include old models) M4/M16 AEG series | |
| Precision Rotary Dial Knob for fine hopup adjustments | |
| Re-engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot | |
| Removable Steel Pivot Pin for ease of setup and maintenance | |
| Accepted 21.00mm to 21.25mm nozzle length | |
| Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use | |
| Wisely equipped with an interchangeable Inlet Adaptor OD12mm to ensure the hopup unit is inserted exactly in the center of the 12mm inner bore ICS AEG Gearbox nozzle outlet without wobbling. (Inlet Adaptor OD11mm and OD11.5mm are sold separately) | |
| Mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots | |
| Included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting | |
| Equipped with 2 compression springs on top and center to ensure the hopup unit is seated straight and air tight during use | |
| Specially designed with a new BB Latching System to prevent BB dropping after removing the magazine | |
| The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber | |
| Compatible with any 12mm inner bore ICS AEG Gearbox nozzle outlets | |
| The Dual UV LED Tracer Module to glow BB in the dark ready! |
| Weight | |
| N/A grams |
| Usage | |
| Compatible with most ICS CXP/CS4/EBB (include old models) M4/M16 AEG series |
| Requires | |
| Wearing eye protection is recommended | |
| Use proper tools for disassembly and reassembly the gear box with great care due to spring tension | |
| Bearing lubricant oil/grease is recommended for smooth operation |
| Instruction | |
| Instruction Manuals are included |
ICS® is a registered trademark of ICS Enterprise Co., Ltd.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.0 ★★★★★
Based on 1564 reviews
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Product Reviews
★★★★★ 5
Beautifully simple
Color: Black/Digital/Green
My son has worn a smaller version of this watch for a few years. After trying a different brand lately, which broke way too easily, I found this one on Amazon listed as "Used - Very Good" condition. I received what appeared to be simply an open box item, otherwise it looked brand new.
This watch fits me really well, and is not clumsy on my wrist, it does not get in the way of everyday motions. For me, it's just the right size. It is also pretty intuitive to use and set the alarms, etc. It has 3 alarms, each with a different sound. It can be worn in the shower without issue, I have not tried a swimming pool, though. It feels tough and durable, as my son's has proven to be. I'm very happy with this purchase.
*** Update: I spent considerable time in swimming pools recently while wearing the watch. It's still as good as when I opened it. Still 5 stars.
*** Update 2: a year-and-a-half of wearing, and it is performing really well! All the buttons and words on the watch are still in very good shape and easy to read. I wear this every single day. I don't put it through the wringer every day. But, I did spend a full week sailing and snorkeling last summer in salt water with hours each day in the water. It still looks and works the same as the day I bought it.
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Reviewed in the United States on July 12, 2022
★★★★★ 5
So simple
Color: Black/Digital/Green
Love it
So simple
I don’t even think about it
Ready to go every day
Band is very comfortable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 15, 2026
★★★★★ 5
Good
Colour: Black/Silver-Tone
Like the look and functions
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Reviewed in Singapore on 12 January 2023
★★★★★ 5
Perfect for Training (Swimming) Purposes.... 5 Star for what it does as a training watch!
Color: Black/Yellow
This is already my 2nd TIMEX which I use for my swimming practices..
This one beats the older model (Timex 51931 Ironman Triathlon) with some interesting changes:
1) The larger digits on this model makes it easier to read the numbers (as some mentioned to do so when running) even when I am swimming, with a quick flick of the wrist at the turn, it's possible to see the minutes and the seconds.... The older model had smaller number, thus not making it possible to do this.
2) The navigation on this model became quite easier. It was already easy on the older model but this one included instructions on screen, such as NEXT, DONE, + or - in order to advance with your practices and training... Plus a chance to change the way you want to see the information of the your laps (Laps in the big digits and splits at the smaller one, or the oposite)
A Real nice add on by TIMEX.
3) A simple but effective wrist band "clip" (the tiny piece of strap that attachs the "extra" wrist band that is left after you put the clock on)
It has a piece of rubber on the inside that locks on at the wrist band and does not make it loose or even letting it go as some other watches do sometimes. This is more effective underwater I think, as it remains the way you set your wrist, as the older model I had did not quite held in place all the time.
4) Plenty of memory (100 laps is really a nice number), maybe more then most will need but, as a swimmer I use to count splits over 100m (or yards) with many laps during one training... It is quite usefull. I go easily on 10 to 15 laps of the memory in one training.
And with the date feature, that reminds when you did these times, it is quite usefull to keep track on the training with a spreadsheet, for instance... (as I do !)
5) A really big START/SPLIT buttom that is great to press when I am swimming laps and have to press myself at each turn at the pool.
Just perfect. Never a miss !
And the feature which was already at most of the models, of the repeat countdown, and the start of a chrono, or a repeat (what I use the most) in order race agains your average rhitym inside a certain time frame that you can set it up ! And of course the flix technology, which is very good to have it... Just flick your wrist (when you set it to ON) and it will show you at night all info that you need.
It is another great watch from TIMEX and it deserves a look, specially for the price. It is worth to pay a bit more if you are like me and uses a lot of the memory for the laps on swimming pool. Maybe for runners it can be quite a lot of memory, but the price difference is worth the change, for some of the options mentioned at this review.
This is a really good watch to have..
Will you definatelly like as we all are at these reviews.
:-) It deserves the 5 stars rating !
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Reviewed in the United States on January 10, 2009
★★★★★ 5
Great sports watch.
Color: Black/Yellow
I have to admit to being a bit of a watch fiend, having one for almost everything I do, but this is one of the most useful, yet cheaper priced items I've come to enjoy. When I work out I like as much information as I can get, so for running and biking I have a watch for that, but for swimming I needed a watch to help me count my laps and log my times. The Timex Ironman 100-lap watch does this quite well. I first got a Timex 50-Lap watch that I was able to find locally, but 50 laps is very limiting so when I found this watch for less money and a bigger face that had the lap/split time and lap number on the screen at all times I knew I had a great product. When you're finished with your laps just save your workout. The watch will then calculate some information like average lap time and best lap. I haven't completely messed with their data, but I think they average your times by throwing out the lap times that are the outliers, which is good for the accidental laps where you hit the wrong button, but it's not as great when you did a few sprint laps and they don't show up as your best time. If your best time isn't on there you can still recall it by going through each lap individually, but I think my sprint laps sometimes aren't listed as my best laps. I haven't messed with this feature much because it isn't important to me, and removing the outliers is good for looking at your actual pace. I have been able to push myself a bit more in the pool by having actual numbers to compare, which is very helpful. The other features on this watch I haven't used much, but for someone who can't afford a GPS watch and can use maps or a track this watch would be great for running or anything with laps or intervals.
It has up to 9 interval timers and once finished it can either stop or repeat the sequence. It can do what's called chrono at the end, where it just switches to the chronograph feature after your timer or interval timers are finished. Overall this is a great watch and for most people who enjoy doing anything with laps look no further.
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Reviewed in the United States on July 5, 2012