New RIF chrono'd hot on her first outing. What can I do (EC MCX)

B

BigBigJeff

Members
Joined
Oct 17, 2024
Messages
7
Reaction score
10
As the title says. Recently bought an E&C MCX Rattler LT from 18 airsoft.

IMG_0867.webp
Was planning to use it a few times stock at least before sending it off to a tech for any serious upgrades. However, on its very first outing yesterday, its chrono'd hot. I dont have a chrono at home so I wasnt to know ahead of time. Was 300-302fps on 28's which is over the site limit. Obviously agreed not to use it and put it away (luckily I had bought my other toys), but wondering whats the best way to power this down slightly. Ideally dont want to be right on the power limit.

Any tips or advice welcome
 
Did you have your hop set? If you didn't, set your hop before chronoing it and try again. Hop normally shaves some fps off.

Depending on the sites limit, you're only just over. 290 is 1.09 and 300 is 1.17. Assuming you're at a standard site that does 345 on a 0.2g bb (check out an airsoft joule chart for easy reference).

I'd say your options are: full auto a few mags and let the spring "bed in", this is possible to drop 7-10 fps for this which should make put you on the legal limit.

Other options if the above doesn't work is a weaker spring or a slightly less optimal inner barrel, but this would depend on what you have already as to what I'd suggest putting in.

Edited as I didn't realise there was a quick change spring.
 
Last edited:
With it being a fairly recent E&C gearbox, will it not have a quick change spring system?

If adjusting the hop doesn't bring it down enough, then have a look at that?
 
It has a quick change spring; buy a chrono, an M95 spring, an M100 spring, and an M105 spring and see which one gets you under the limit with your hop set properly. Job done! The nice man at @ak2m4 will sell them to you.
 
Last edited:
Tad said:
Just use heavier weight BBs? Also bear in mind
Click to expand...
Click to shrink...

wait, what!?
that is not how aeg's work my dude, heavier bb's are not going to yeild a significant material impact on the energy levels. at least not in a healthy gun.

the velocity will drop yes, but not the energy, and the energy makes the owchie.

Tad said:
Also bear in mind, brand new means the Hop hasn't settled yet either. So that should be fully off.
Click to expand...
Click to shrink...

hop off is bullshit, plenty of aeg's will do all sorts of wacky nonsense at either end of the hop travel. you should be chrono'ing with the same setup you plan on firing at your fellow humans, hop settings and all.

Tad said:
Try it with .32s.
Click to expand...
Click to shrink...

nope, the only way here is to reduce the spring energy either by using a weaker spring, reducing its pretension (if it has dual thrust bearings for example drop down to one) or short-stroking.

Tad said:
If you're over with .28s I hate to think the Joules of .2s through that.
Click to expand...
Click to shrink...

it'll be the same as what it's firing now.

yes there are gun varieties that will change energy output depending on the weight of ammo used, but that doesn't apply to a bog standard aeg.
 
Tad said:
Just use heavier weight BBs? Also bear in mind, brand new means the Hop hasn't settled yet either. So that should be fully off.

Try it with .32s.

If you're over with .28s I hate to think the Joules of .2s through that.
Click to expand...
Click to shrink...
Which sites do you play at? I would like to know so that I can avoid them and you.
 
Tad said:
Just use heavier weight BBs? Also bear in mind, brand new means the Hop hasn't settled yet either. So that should be fully off.

Try it with .32s.

If you're over with .28s I hate to think the Joules of .2s through that.
Click to expand...
Click to shrink...

meme03.webp

You can't just change BB weight to get your power down - he needs to change the spring. Heavier BB = lower FPS but the energy (joules) is going to remain the same. Or they could go for the FAO route and drill a hole in the nozzle.
 
Last edited:
Thanks for all (most anyway) of the tips! Yeah buying a chrono is definitely on the shopping list after this fiasco. Just never had a new stock rif be anyway close to hot before but lesson learnt I guess!
 
BigBigJeff said:
Thanks for all (most anyway) of the tips! Yeah buying a chrono is definitely on the shopping list after this fiasco. Just never had a new stock rif be anyway close to hot before but lesson learnt I guess!
Click to expand...
Click to shrink...

Looks nice. Did you get dinged by customs when it got into the country? IIRC the spring is a quick change under the picatinny rail that the stock attaches to.
 
As others have posted, it's got a quick change spring so swapping it out for something a little less spicy will be an easy job l, even if you're as cack handed as me with tech work.

Ignore what Tad posted as it's simply bollocks. Changing BB weight won't change the muzzle energy.

A chronograph is always a good investment, especially if you're going to do any tech work.
 
BigBigJeff said:
Thanks for all (most anyway) of the tips! Yeah buying a chrono is definitely on the shopping list after this fiasco. Just never had a new stock rif be anyway close to hot before but lesson learnt I guess!
Click to expand...
Click to shrink...

chrono is always a useful thing to have.

typically i've found the opposite problem to be more common, buy a new gat with a spring downgrade which consists on them replacing the stock spring with whatever was in the clicky pen they had handy.
 
Adolf Hamster said:
chrono is always a useful thing to have.

typically i've found the opposite problem to be more common, buy a new gat with a spring downgrade which consists on them replacing the stock spring with whatever was in the clicky pen they had handy.
Click to expand...
Click to shrink...
Same! Usually seems to involve the shop just cutting a third off the back of the standard spring, and hovering around the 0.9j range. I've got a box of useless trimmed springs that is constantly getting added to.....
 
Depends how technical you are. You are ‘only’ .05/.06J over normal site limits. If the spring is quick change I would be tempted to take the spring out heat it and compress a couple of coils to take a little power out. You need a chrono as above and it’s a bit hit and miss or as Colin Allen said pick up a m95/m100/m105 and swap them around. In my experience not all springs are the same with some being longer which can also add power even though they are a lower m numbered spring.
 
As above but before you go changing springs spam the hell out of it in the garden/at site range, a new spring in my experience will be hot until a little bit of use tames it.

You don't even need bb's but bb's make it more fun.
 
Cannonfodder said:
I thought dry firing an AEG isn't a good idea as it can damage the gearbox casing. Something to do with the BB slowing down how quickly the air leaves the cylinder and so slowing the piston so it doesn't hit the end of the cylinder so hard
Click to expand...
Click to shrink...

Yeah, whatever the muzzle energy of your bb's are has to go somewhere, and if it aint pushing a bb out the barrel it's hitting the front of the casing.

Might be fine if the casing is strong enough, but for the sake of setting up a target and having some fun might as well send some plastic downrange.
 
You must log in or register to reply here.

Similar threads

Matt19891947
What connector is this?
Replies
8
Views
192
ButcherBill
ButcherBill
S
Help with upgrades on G&G wild hog
Replies
14
Views
722
Colin Allen
Colin Allen
S
Lancer Tactical Gen 2 M4 AEG Rifle bundle with accessories
Replies
3
Views
94
Enid_Puceflange
Enid_Puceflange
Reef
ICS L85 refresh
Replies
3
Views
425
Reef
Reef
Puttees445
Unknown component, looking to identify
Replies
3
Views
330
Egon_247
Egon_247
Back
Top