Upgrade? or sell to buy new

[Nabors]

I have a non blow back combat machine M4 it was the first airsoft gun I purchased. I want to have a gun that is extremely accurate at a good distance away and have good fps and a decent rps. Should I try to upgrade this aeg or sell it and buy another to achieve my goal. Oh and i want to keep the M4 model I am in the military so im used to carrying a M4

Goal:
400fps
150ft accuracy
Decent rps
Reliable
Easy to maintain

Is all this possible? Still new to airsoft.

[Star_folder]

It's easily possible, and I know of at least one other person who has a CM M4 upgraded the way you want.

Now, do you want 400fps with .2g bbs or with .25g bbs? 400fps with .2g bbs is a 20ft MED, while 400fps with .25g bbs is a 50ft MED. One runs off of an M120 spring, and the other uses an M130 or possibly an M140 spring.

Your accuracy should already be very good at 100ft. But what bb weight are you using? Consider using .25s or .28s if you aren't already, as they will give you more accurate shots without having to do any internal work to your gun.

Your RPS can be improved with a larger battery. What kind of battery are you using? If you are using an 8.4v battery, think about upgrading to a 9.6v, or even a 7.4v lipo. The new batteries will give your motor more power, and will increase the rate of fire that it puts out.

It should still be as reliable as ever with these upgrades, and just as easy to maintain as it was before you changed stuff around.

[Nabors]

Hey sorry meant to be 150ft. I've ran both .2 and .25 I'm not sure which i would running more than likely the .25. I use a 9.6v battery currently. I just see a lot of people using kwa m4 and vfc m4 is the main reason I was asking. And if 150 is easily achievable Im wanting to be ahead of the game. I want me gun to be able to shoot accurately at a good distance when most other peoples guns struggle. So if accurate at 150ft is not considered a "very accurate gun" what is. Main thing I am tired of being able to see my target and my gun just not being able to hit them.

[Bishop]

I run a G&G cm m4. I've put roughly 150 bucks of parts into it, and with Star_folders wonderful work, tuning and flathop. I reach out accurately to 250 feet(hopefully 275 now it has the m140 instead of a m130) with 28rps. G&G cm m4's are awesome, kwa and vfc are nice, but for the price nothing can beat a cm IMO

[Nabors]

Is there any major difference between the blow back cm m4 and the non blow back. Which to you have buttontk

[Star_folder]

He has the blow back M4.

The major difference, besides the lack of of blowback, is that the blowback version has a spring release feature, so that you can release any spring tension that may be in your system. Basically, it means you don't need to fire in semi a few times to save your spring, you can just hit the button. Other than that, they are the same guns.

[Nabors]

whats its shooting fps wise to reach 250 accurately and i would assume .25s?

[Star_folder]

whats its shooting fps wise to reach 250 accurately and i would assume .25s?

Before I put the M140 in, it was shooting 350fps with .25s.

[Bishop]

Accurate depends on your definitions. I don't think I could hit a bullseye on a 8 by 11 paper at 250, but I can (and have) hit man sized targets at those ranges. When it comes to past 200' I don't have much experience, since that range belongs to Star folder lol.

[Nabors]

Ok so as far as springs go should i just grab any or is there a name brand I need to get. Such as systema echo1 ect. Also ive heard upgrading the inner barrel will help alot if so which should i go with. Oh and what about upgrading the hop up and hop up bucking? Thanks for the help also. So the internals on my non blow back cm m4 can handle 350-400 fps with a 6.01 inner barrel m130 or m140 spring and a decent sight should allow me to reach out and hit someone at around 250ft with ease.

[Star_folder]

As it turns out, your hop up is more important than the inner barrel. I would suggest upgrading that. There are several options, such as the Flat Hop, PDI W-Hold bucking, or KWA/Firefly buckings.

And as for barrels, what's important is the quality of the barrel, not the bore. I would instead suggest a Prometheus barrel, they are stainless steel, very high quality, and are 6.03mm instead of 6.01.

Springs, I like Guarder Springs, but for the most part, any brand will work, just be sure you get one that will put you in the fps ball park that you want.

[Nabors]

Whats the difference in a hard and a soft bucking. Oh and why 6.03 and not 6.01

[Star_folder]

Whats the difference in a hard and a soft bucking

Hard buckings are supposed to offer a better seal with the air nozzle, meaning a more consistent fps and more consistent shots. However, they don't apply hop to bbs as well as soft buckings, so you end up sacrificing range for consistency in your shots.

Soft buckings give better hop to bbs, but sometimes don't seal as well against the air nozzle. Even though you have greater range, you're shots may not be that consistent.

However, the point at which "soft" buckings stop sealing is much higher than you are wanting to go. IMO, anything past 3J or 500fps with .25s and you'll start to have sealing issues when using buckings labeled as soft. Personally, I'm using a KWA 2GX bucking in my DMR which shoots closer to 3.5J and it seals well, but it doesn't apply hop to my bbs. I've also used Madbull Red buckings and they've sealed very well at a great many fps ranges, and still provide good hop. I've yet to test PDI W-Hold buckings at higher fps, but I can tell you that they seal well at anything 400fps and under.

And 6.03 instead of 6.01 is because of improved air flow around the bb, basically, it ensures that it is still flying straight out past 150ft.

[Nabors]

So the internals of a non blow back cm m4 will hold when using a spring that says it range is 350-400

[Vesper]

So the internals of a non blow back cm m4 will hold when using a spring that says it range is 350-400