Jump to content

Making a DMR


The captain
This thread is over three months old. Please be sure that your post is appropriate as it will revive this otherwise old (and possibly forgotten) topic.

Recommended Posts

Hi Guys,

 

So i want to learn to tech. and i also want a DMR, so my plan is to make my Nuprol M4 into one. I know i need a MOSFET that i can programme to safe-semi-semi so i can class it as one. and i have a spring that will have be shooting at 450. but i know i have to take most of the gun apart to install this spring. So i was wondering if anyone can tell me what else is reccomended to make a DMR.

 

Any other Tech-ing tips would be greatly appreciated.

Link to comment
Share on other sites

Technically you could just put a big whopping spring in it, cut down the selector plate and call it good. How long it will last would be the problem. This is what I have done for all my DMR's. 

 

Prometheus 6.03 Tightbore barrel matched to your current inner barrel length. 

Upgraded hop unit if possible.

Flat hop tensioner and prommy purple bucking. 

22TPA Neodymium motor paired with a set of 13:1 gears (Trigger response)

Basic Mosfet like an Acetech. 

M110-M120 spring depending on your local DMR site FPS rules. 

New Bearings or bushings for the gearbox. 

Decent piston. 

Link to comment
Share on other sites

  • Supporters
18 minutes ago, The captain said:

I know i need a MOSFET that i can programme to safe-semi-semi

 

Er, no. As @Asomodai says, you can cut a bit off the selector plate so that it can't engage full auto.  See:

 

 

Link to comment
Share on other sites

48 minutes ago, Asomodai said:

Technically you could just put a big whopping spring in it, cut down the selector plate and call it good. How long it will last would be the problem. This is what I have done for all my DMR's. 

 

Prometheus 6.03 Tightbore barrel matched to your current inner barrel length. 

Upgraded hop unit if possible.

Flat hop tensioner and prommy purple bucking. 

22TPA Neodymium motor paired with a set of 13:1 gears (Trigger response)

Basic Mosfet like an Acetech. 

M110-M120 spring depending on your local DMR site FPS rules. 

New Bearings or bushings for the gearbox. 

Decent piston. 

Okay, what dictates if upgrading the hop is possible ? also when you say upgraded hop unit do you mean a nub and a bucking ? or the actual cogs and the rest ?

and cutting down the selector plate required opening the gear box, ive never done that before, dont want to break the gun before im finished converting it.

I have the spring already. and what is a "Flat hop tensioner".

The prommy purple bucking says for fps under 400.

 

Sorry i got loads of questions man, im new to opening these beauties up and changing stuff, i have seen so many videos on how to actually do it, but i dont really know about parts and whats better for what job and why.

Link to comment
Share on other sites

  • Supporters
40 minutes ago, The captain said:

Okay, what dictates if upgrading the hop is possible ? also when you say upgraded hop unit do you mean a nub and a bucking ? or the actual cogs and the rest ?

and cutting down the selector plate required opening the gear box, ive never done that before, dont want to break the gun before im finished converting it.

I have the spring already. and what is a "Flat hop tensioner".

The prommy purple bucking says for fps under 400.

 

Sorry i got loads of questions man, im new to opening these beauties up and changing stuff, i have seen so many videos on how to actually do it, but i dont really know about parts and whats better for what job and why.

 

Go read this: 

If you're still set on going DMR you will have to open the gearbox regardless. 

 

 

Link to comment
Share on other sites

On 30/07/2019 at 15:52, Asomodai said:

Technically you could just put a big whopping spring in it, cut down the selector plate and call it good. How long it will last would be the problem. This is what I have done for all my DMR's. 

 

Prometheus 6.03 Tightbore barrel matched to your current inner barrel length. 

Upgraded hop unit if possible.

Flat hop tensioner and prommy purple bucking. 

22TPA Neodymium motor paired with a set of 13:1 gears (Trigger response)

Basic Mosfet like an Acetech. 

M110-M120 spring depending on your local DMR site FPS rules. 

New Bearings or bushings for the gearbox. 

Decent piston. 

Out of Curiosity, just how long would it last ? if i just get a new spring, nub, bucking, motor, barrel, and use a mosfet to lock to semi. No new Piston or gears or bushings. Are we talking a few thousand less shots before it gives out ? or are we talking itll fall apart in 500 shots ? also what is likely to go first when putting in a bigger spring ? im assuming the piston ?

Link to comment
Share on other sites

18 minutes ago, The captain said:

Out of Curiosity, just how long would it last ? if i just get a new spring, nub, bucking, motor, barrel, and use a mosfet to lock to semi. No new Piston or gears or bushings. Are we talking a few thousand less shots before it gives out ? or are we talking itll fall apart in 500 shots ? also what is likely to go first when putting in a bigger spring ? im assuming the piston ?

How long is a peice of string? It depends how each part manufactured was QCed at the factory if at all. All the stock stuff in cheap rifles like yours are built to a low cost to perform well enough for the stock FPS. The more you spend the less chance of it it being a lemon. 

 

Just get it all done at once so you dont have to take it apart for a long time.

 

First thing to go is likely Piston, though I have broken more gears then pistons due to poor shimming. 

 

If you are going to replace the spring you have to take apart the gearbox anyway. 

Link to comment
Share on other sites

  • Moderators

I would so say to get yourself a chrono, if your tinkering & trying to get to a particular fps you don't want to have to arrive on site & rely on their chrono, you might get turned away ?.

its prob the next thing on my shopping list, got a load of fettling to get on with, once I can hold my tools lol 🤕

Link to comment
Share on other sites

I’d be lost without a chrono. Best £50 I’ve spent in airsoft. 

Link to comment
Share on other sites

  • Supporters
10 minutes ago, Wo1f said:

I’d be lost without a chrono. Best £50 I’ve spent in airsoft. 

 

agreed, very useful, especially when mis-advertised springs are a thing.

Link to comment
Share on other sites

@Adolf Hamster@Wo1f@Tackle I Have just ordered one, based on you guys's suggestion. thanks

18 hours ago, Asomodai said:

How long is a peice of string? It depends how each part manufactured was QCed at the factory if at all. All the stock stuff in cheap rifles like yours are built to a low cost to perform well enough for the stock FPS. The more you spend the less chance of it it being a lemon. 

 

Just get it all done at once so you dont have to take it apart for a long time.

 

First thing to go is likely Piston, though I have broken more gears then pistons due to poor shimming. 

 

If you are going to replace the spring you have to take apart the gearbox anyway. 

Surely all gearboxes are shimmed well by default ??? Do you only worry about shimming if you change somehting ? or is it good to get in there and do it to any gun you have ??

Link to comment
Share on other sites

23 minutes ago, The captain said:

@Adolf Hamster@Wo1f@Tackle I Have just ordered one, based on you guys's suggestion. thanks

Surely all gearboxes are shimmed well by default ??? Do you only worry about shimming if you change somehting ? or is it good to get in there and do it to any gun you have ??

 

Wishful thinking I am afraid. Hardly any gearboxes have been shimmed properly or the AOE corrected from factory. 

Link to comment
Share on other sites

 

30 minutes ago, The captain said:

Surely all gearboxes are shimmed well by default ???

 

 

On 30/07/2019 at 15:46, The captain said:

my Nuprol M4 

 

Lol 

Link to comment
Share on other sites

You’ll be lucky to get a gun that’s shimmed well, never mind perfectly from the factory.  Some manufacturers are better than others, but every company has their lemons and perfect guns. 

Link to comment
Share on other sites

damn, i guess ill need to shim it then. didnt realise they wouldnt come already done, seems like something that should be done. Any to do this the first time ??

Link to comment
Share on other sites

  • Supporters
1 hour ago, The captain said:

damn, i guess ill need to shim it then. didnt realise they wouldnt come already done, seems like something that should be done. Any to do this the first time ??

 

It will be shimmed, just not well.

Link to comment
Share on other sites

  • Supporters
3 hours ago, The captain said:

damn, i guess ill need to shim it then.

 

Well, maybe.  My £75 CYMA M4 was spot on, although I accept that was just down to luck rather than any sort of diligence at the factory.  If you're in there doing the spring anyway then you might as well clean out the China snot grease and do the shimming.  A pack of assorted shims is only a few £££ and all it needs is following one of the many video tutorials and some patience.

Link to comment
Share on other sites

53 minutes ago, Rogerborg said:

 

Well, maybe.  My £75 CYMA M4 was spot on, although I accept that was just down to luck rather than any sort of diligence at the factory.  If you're in there doing the spring anyway then you might as well clean out the China snot grease and do the shimming.  A pack of assorted shims is only a few £££ and all it needs is following one of the many video tutorials and some patience.

a broken clock is right twice a day.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...