Advice on these upgrades needed

[grimreefer]

I'm planning on doing another round of upgrades on my TM MP5. So far I've got a bearing spring guide, Modify 100 spring, and steel bushings. I need some more range and accuracy, so here's what I'm planning:

Mad Bull Quicksilver Black Oxide Silencer (157mm)
Mad Bull 6.03mm Tightbore Barrel - 509mm (cut down to approx. 385mm)
Prometheus Air Seal Chamber Packing (Hard Type) Hop Up Rubber

I'm considering the following:

Modify 110 Spring
Modify Polycarbonate Bearing Piston Head
Modify Air Seal Nozzle - MP5 Series

I'd like to get some advice or approval regarding these parts. Is my barrel length okay? Anybody know if the Modify Poly piston head is any good? Should I consider any other parts? Would a polycarbonate piston reduce wear on the gearbox?

I'd like to be able to get everything I need from airsoftparts.ca

Much appreciated!

[HaZarD SFD]

Grimm I would suggest some metal bushings, shimms, to properly shimm the mechbox.. Also you can just buy a 400+ MM barrel and its less cutting and less cost imho. If you have the MP5 SD you can get a barrel that will basically go just too the end of the silencer.

Everything else looks good. The modify head is a great add on.. I have one in my ICS and its taken alot of abuse. I would however suggest a guarder clear rubber instead of that hard type.. Those are mainly made if my thoughts are correct for 400+ AEG's.

Your accuracy will tighten a bit with the 6.03 but range you might get a bit further..

[Styrak]

Sounds good. Why don't you buy an M4 length barrel instead? 343mm is close to what you want and you don't need to do any cutting?

[Jugglez]

Don't cut down Mad Bull barrels, they're teflon coated and it'll likely get damaged.
There is a 363mm length available and it's not far off from your desired length.

[grimreefer]

Originally Posted by HaZarD SFD

Grimm I would suggest some metal bushings, shimms, to properly shimm the mechbox.. Also you can just buy a 400+ MM barrel and its less cutting and less cost imho. If you have the MP5 SD you can get a barrel that will basically go just too the end of the silencer.

Everything else looks good. The modify head is a great add on.. I have one in my ICS and its taken alot of abuse. I would however suggest a guarder clear rubber instead of that hard type.. Those are mainly made if my thoughts are correct for 400+ AEG's.

Your accuracy will tighten a bit with the 6.03 but range you might get a bit further..

I have installed metal bushings and re-shimmed the mechbox. I'll also need to re-grease it since the last time I was in there it was looking a little dry. About the hard type bucking...I was thinking with the other upgrades, I'd end up around 400 fps? Right now it's shooting about 330 fps. The compression could be better; hence the piston head and nozzle. The stiffer spring, better compression, and tight bore I thought would bring me up to 400 fps?

Originally Posted by Jugglez

Don't cut down Mad Bull barrels, they're teflon coated and it'll likely get damaged.
There is a 363mm length available and it's not far off from your desired length.

I'll go with that one then.

[Naglfar]

Systema silent piston and cylinder head - much easier on the mechbox under a tight spring. May as well then buy a systema cylinder so that they all fit better. Also buy an extra piston to keep as a backup, may as well also grab 2 hop buckings too because they're cheap.
Definitely buy the 364mm barrel, 2cm isn't going to make any difference.

I don't know what is out there for replacement hopups on an MP5, I'd like to replace mine but can't think of any brands at the moment.

[grimreefer]

Originally Posted by Naglfar

Systema silent piston and cylinder head - much easier on the mechbox under a tight spring. May as well then buy a systema cylinder so that they all fit better. Also buy an extra piston to keep as a backup, may as well also grab 2 hop buckings too because they're cheap.
Definitely buy the 364mm barrel, 2cm isn't going to make any difference.

I don't know what is out there for replacement hopups on an MP5, I'd like to replace mine but can't think of any brands at the moment.

I may just take that advice and go with the silent head set. I don't think there's a suitable systema cylinder at airsoftparts.ca though.

I was also wondering about a better hop-up unit. I'm sure jugglez knows what's available?



Soo....what's the point of a polycarbonate piston? Is it just to improve ROF? Will it reduce impact on the gearbox at all?

[Jugglez]

There's nothing wrong with the MP5 hop-up unit, unless yours is broken why replace it?

Your TM original piston is actually a very good piston, run it till it breaks.


Go with the Modify Piston head with sorbo pad, much cheaper option than a Sysema Silent head set and works just as well.


For hop-up rubber Guarder Black should be fine.

[m102404]

You're all set...just stick with a 343mm barrel and don't sweat the little bit shorter barrel.

If you're compression is good and your nozzle/hopup seal is good, you should end up around 400fps with 0.20's.

Note, if you go with a M100, you'll be in the high 300 fps and you're trigger response will be better and your ROF will be higher than with a M110. Battery and motor will last longer as well. And no risks that you'll chrony over 400 (don't know your field limits but it's 400 around here).

Best of luck...

[grimreefer]

Well I couldn't afford $200+ for upgrades this week. So I bought the silencer, tightbore, and hop-up. The mechbox upgrades will have to wait until next paycheck.

Anybody anticipate me having a problem with the new length barrel and my stock cylinder? It would be a royal pain in the ass to install it, find out it's sucking bbs, and then re-install the old one.

[Marriott]

Originally Posted by Jugglez

Don't cut down Mad Bull barrels, they're teflon coated and it'll likely get damaged.
There is a 363mm length available and it's not far off from your desired length.

Madbull are just aluminium... Prometheus are stainless steel. There one brand that makes a Teflon coated one but as far as i am awaure its not Madbull...

[grimreefer]

Originally Posted by m102404

Hahaha...welcome to the world of upgrading AEGs...

gee thanks :P

[maporms]

Originally Posted by grimreefer

I'm planning on doing another round of upgrades on my TM MP5. So far I've got a bearing spring guide, Modify 100 spring, and steel bushings. I need some more range and accuracy, so here's what I'm planning:

Mad Bull Quicksilver Black Oxide Silencer (157mm)
Mad Bull 6.03mm Tightbore Barrel - 509mm (cut down to approx. 385mm)
Prometheus Air Seal Chamber Packing (Hard Type) Hop Up Rubber

I'm considering the following:

Modify 110 Spring
Modify Polycarbonate Bearing Piston Head
Modify Air Seal Nozzle - MP5 Series

I'd like to get some advice or approval regarding these parts. Is my barrel length okay? Anybody know if the Modify Poly piston head is any good? Should I consider any other parts? Would a polycarbonate piston reduce wear on the gearbox?

I'd like to be able to get everything I need from airsoftparts.ca

Much appreciated!

I'm not sure with the Modify Piston Body brand, but Polycarb Piston Bodies does not necessarily reduce the wear on the mechbox but to the Piston Body itself. If its polycarb, I guess its better than using the stock TM Piston Body. As for the mechbox, proper shimming and use of metal bushings would reduce the wear on the gearbox. What is the equivalence of a Modify m110 spring to a let's say Systema Spring. If I'm not mistaken, A modify m130 is the same as a systema m150 which produces 550 fps. If a Modify m110 is the same as lets say, a PDI 190 Spring or a Systema M120, then its safe on your mechbox. And regarding the hop up rubber, i advise to use a softer bucking than the Prometheus since you would be using a softer spring. Regarding the tight barrel length, i suggest you either use a Type-2 or Type-0 Cylinder, just experiment between the two and use whichever yields the higher fps. I bet my money on the Type-0 with that barrel length.
And properly seal all airleaks.

[m102404]

I meant the snide remark is a good way...LOL.

Upgrading your AEG (and kudos to you for figuring it out and doing your own!) can be both rewarding and massively frustrating at the same time. There are some general guidelines for good setups...but most times you just have to try it out and see what you get.

Because of the slight variances with all the parts and the number of things that can affect the end result (be it FPS, accuracy or ROF) it's near impossible to say..."add part X and you'll get result Y".

Obviously some rifles are easier than others to work on...unfortunately, with a TM MP5, you've got to take out a good number of screws and split it in half to get to the goods. And just when you think you've got it...you strip screw hole threads, or drop one stupid little o-ring and can't find it, or slip with the screwdriver because you're rushing it and scratch the finish, or any other bone head thing.

The worst part (if you're obsessive compulsive like me) is when you have your rifle setup perfectly...and then tear it all apart again just to fiddle with something else for the hell of it! LOL.

Then you end up with enough spare parts to almost make another one...and it starts all over...

Last week I bought a SAW...70% of the reason I bought it was for the quick change spring feature. I've got about 30 misc springs that I want to chronograph and I don't want to have to disassemble my M4 just to try each one of them out!

[Syn]

Doubt you would have to worry about barrel suck at 385mm unless you are using a crazy ROF setup.

http://www.airsoftforum.com/board/in...#entry17451171