Quote:
Originally Posted by MP5HERO
like the title says, i want to build up an M4 from scratch ( no, not buy an M4 and add new stuff, completely build it from the ground up.) but i have a few questions from anyone who can lend a hand and has some time. firstly, what are some of the best types of internals to purchase. i hear alot of people putting in systema internals but have heard nothing about systema other than their PTW series. secondly, to make it complete, what am i gonna need to purchase to have this thing running properly, and lastly, what are some of the best external parts to aquire?
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Lets start off with a few questions.
How do you want it to look?
What kind of front end do you want? Standard grip? RIS/RAS? MRE? Short?
What kind of trades do you want on the reciever? Colt? Special Forces? Blank?
What kind of stock do you want? Crane stock? Full Strock? Shorty Stock?
What is the time frame you want this project completed? Time frame can be a variable in regards to ones budget.
Now that you have the image in your head lets make a check list from front to back of externals components required. Feel free to copy and paste and then fill in what you decide as you go.
Front
Flash hider
OuterBarrel
Front sight/Gasblock
Front grip
Middle
Reciever
Grip w/motor plate and screws
Body Pins
Trigger Guard
Charging Handle
Mag Catch
Selector Lever
Bolt Catch
Rear Sight/Carrying handle
End
Stock Tube
Stock
Internals
Inner Barrel
Hopup unit
Mechbox
Motor
Battery
Lets talk about the mechbox for a minute, personally for myself when I did my own custom build I simply used a stock Tokyo Marui mechbox to start. Eventually a few of the internals were changed over to Systema with the exception of the spring which is modify. Recently though, all of the systema parts have been replaced with Prometheus parts.
If you are purchasing a prebuilt ready to drop in mechbox, be sure to consider where you want your battery storage to be, in the front or in the stock. Some people will recommend going with a prebuilt systema mechbox, however I found Tokyo Mauri to be just as satisfying even before upgrades.
In regards to your question about if you can or cannot use an version 2 MP5's mechbox for your M4, well you can but you will be required to change out the selector plate as that is designed specifically for the MP5 reciever and not that of an M4.
As for which parts to use, thats entirely up to you and your budget. For my build I ran exclusively with King Arms for all of my externals on my M4. However its understandable that sometimes its not with in a budget to use only one company. If possible, when it comes to your internals try to stick to one or two companies. When it comes to piecing your mechbox together, most people tend to agree that when building a mechbox its better to use all the same companies parts as they are designed to work together better. A
As for which parts are the best, unfortunetly I cannot say. If I were to say sytema internals where the top, modify users would disagree, if I were to say modify was the best, systema users would disagree. However from my personal experience with trial and error I found that both companies make quality parts for mechbox internals. There are many good companies out there that produce good parts. Look around online, do some research and you will see which ones are worth your time. Also, dont forget to buy the appropriate greases and lubricants for your mechbox as well!
If you are planning on building a mechbox from scratch I would like to make a suggestion as to what you could use for internals, I recommend going with Prometheus, do everything prometheus internally that you can afford to do.
From start to end on my M4 build it almost took an entire year and even today I am still toying and tweaking with externals.
Best of luck with your build, custom creations are fun and a great learning experience.