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replacing it with a long motor works fine, I did this with my PDW

haha now I know you're an old fart like me if you remember that!

@Henton03 give me a shout if you need me to measure up for you.

this might be out of date as it's a couple of years old now...

From what I can tell 1 (maybe 2) Chinese factories making brushless at the moment (not including Warhead). Sold under different brands like Option, AOLS and Military Action. All have CNC aluminium casings. My guess they keep brushless production small to allow enough time to make as much money from non-brushless. It will probably take a new player in the market with little or no non-brushless investment to shake things up. At least 1 Taiwanese company also, I think ADV. Check out ShinWei YT channel if your Mandarin is good enough ? Although when I looked at these they looked extremely similar to the ones now being produced by ChiHai in China.

Agreed, for the price point it does everything I need. It's a good solution for a standard trigger switch, gives you the option of hot-swapping and been proved to be pretty reliable.

What improvements would you make?

Few days rnr then a short VMware contract, then back to unpack the ZCI order. New ZCI plastic and metal M4 body samples arriving also which should be interesting ? Then need to fix my problematic website, db errors, prob gonna die soon, whoops! Also been asked to look at the new airsoft defence app. Never enough time in the day is there.

Very cool, congratulations on making it this far. Kinda reminds me of the B&T APC9K

That's programmers talk ?

Even the most reliable AEG can develop faults early on, it's just the nature of the sport sadly. It's probably why there's so many differing opinions. No such thing as a sure thing in Airsoft sadly.

@RostokMcSpoons cylinder internal diameter varies quite a bit, from 23.6mm to 24mm. Recheck the seals on yours. Most problems stem from the piston head o-ring either isn't big enough or something is blocking the vents (not allowing the oring to be pushing out). A BS910 o-ring is slightly larger so grab one of those. The o-ring on the nozzle might make a small amount of difference but in my experience doesn't affect fps greatly, it's more there to keep the nozzle centered.

yup, there's a little business there for sure for someone as the real AR vice grips don't really fit that well for airsoft, well mine doesn't. Can get them from ali for £12 but have to wait a month to arrive.

AR vice grip is what you need but it's a pricey tool for just a one off job

That's exactly why I never did it. However I get asked a lot of questions "what is the best combination of motor and gears" etc. Of course no right or wrong answer.

I think a more relatable test would be testing each motor with 13:1 gears and 18:1 gears together to a device that measures amp draw on semi and full auto. Of course you'll need a better sample of known brand motors etc. Guessing this was for gel blasters? Be nice to see just how spring power including short stroking affects amp draw, buy hey it's a lot of work putting together something like that.

I built myself one of these a couple years ago, handheld not fixed, but every time I pulled back a spring it gave different reading. Do you get much variation in readings?

I would love to see springs measured in newtons at certain points of compression, this is what a spring factory uses and would save so much hassle. A few screenshots from the spring factory where my ones are made.

Try some grease on the spring itself. Additionally whenever I've removed the bearing from the piston head I always notice a 15 - 20fps difference with 0.2g

@Skara some fit both just don't like to say so, I know the plastic zci one does, or does with a small amount of filing around the holes

That is true.... @ModernTimes where you based?

If you went to the store and they advised you a M115 would be fine then they should have also mentioned that you have a compression issue somewhere in the gearbox or hop chamber and that needs to be fixed first. Unfortunately you'll need to open the gearbox to troubleshoot. You can do it yourself of course or try to find a decent tech. My advice, forget about turning it into a DMR for now till you have more experience, unless you want to pay for someone else to do the work.

Not an E&C, can tell by the screws, could be one of the new ZCI though.

Had a customer 2 weeks ago was short-stroking without a chrono ?

My advice is put the M90 back in and just play with it for a few games. Go and watch some upgrade video's on YT, so many great resources out there. Lot of people rush into upgrades but only end up breaking their only AEG. You say you want a DMR, would this be a 2nd AEG or are you planning on converting the CORE?