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Barrett M107 Build

6559 Views 37 Replies 10 Participants Last post by  FMP Airsoft
I am making myself a replica Barrett M107 Bolt action Airsoft Rifle. As of right now I'm in the designing stage. Before I mill or lathe anything out, however, I need the internals. Problem: I don't know what the best internals are, and I really want the best I can get for my budget.

I have been told to look for Laylax, and so far I believe I will be using the Laylax PSS10 190SP Spring for VSR10(this is not for field play, solely for play with friends/recreational target shooting) I want the 600FPS, and I know it will not be easy to pull.

For the barrel I was thinking of using the Prometheus EG Precision Inner Barrel for TM M14 (500mm) because I have heard prometheus is good and I need a 500mm barrel.

I am planning on ordering parts from Airsoft GI(http://www.airsoftgi.com/) so this brings my total to $91. I still need hop-up and a piston(I was planning on making the cylinder myself, as it seems quite simple and I have access to a CNC lathe). I have 12 inches(I could probably push it to 15 inches) in which to fit the spring, piston, cylinder, and hop-up.

My budget is $200. This is a rough budget, I could probably got to around $225. So with what I already have around $109 left for the hop-up and piston. I need a full hop-up, and I do not plan on buying a boneyard gun. The reason I am asking for help is I do not know much about what is best for the internals of an airsoft rifle, and I am looking for good accuracy, range, and power and do not wish to get a bad part and have to buy another.

I will update this thread with reports and pictures of my progress when I get into the building stages.

Thank you!:)

P.S. If this is the wrong place to post this I apologize, it seemed like the best out of the options I had.
21 - 38 of 38 Posts
I'm just not a fan of the PDI chamber but I think you should try it with an M4 chamber and PRothemus barrel, why? Because the M4 chamber seems very easy to upgrade to an ER-hop, and it has a simple design with a long arm so a flat nub can be used too. Of course Cheeseman is more qualified than me to say this considering he does these as a job :p but I think you should try it. I would.
this would allow me a longer barrel as well... as long as its between 500mm and say... 600mm(maybe a bit more) ill be good. i already have the barrel a bit on the short side so longer wont actually hurt at all. even by 100mm. would i have to use an M4 piston and cylinder then too?
No, you can still use an M4 chamber and a VSR cylinder assembly, but you might need to modify the nozzle to make sure it fits down the chamber and still contacts the bucking.

The VSR chamber is easy to convert to an ER-hop, as is the PDI chamber, though I am starting to fabricate hop arms for those conversions (on my own rifles only, for testing right now). On the VSR, the biggest issue is the bucking, but you can get around that. I personally like the M4 chambers for the ease of TDC and ER-hop at the same time, but I also have not worked on any m14 hops since starting my TDC stuff.
What's the difference between that and any other M4 hop-up? As Cheese Man said, you'll probably have to do some modding for it to work with a VSR-10 cylinder.
What's the difference between that and any other M4 hop-up? As Cheese Man said, you'll probably have to do some modding for it to work with a VSR-10 cylinder.
just making sure it was right, and wouldnt break on me.
That should work just fine.
would i be able to use an M4 piston and still use the spring? or should i stick with a VSR piston and if i cant manufacture a good enough cylinder just try to mod a VSR one?
I would stick to the VSR piston for the greater air volume, personally.
What are you planning on doing exactly? Will it be VSR-10 internals with an M4 hop-up unit and then the body made by you?
What are you planning on doing exactly? Will it be VSR-10 internals with an M4 hop-up unit and then the body made by you?
pretty much yeah.
pretty much yeah.
Interesting. Looking forward to seeing how everything turns out; best of luck.
A m4 hop up system wouldn't be my first choice but I guess to each his own.
The M4 hop system is actually pretty nice when it comes to TDC and LRB mods, nice and spacious top piece to work with.
Interesting. Looking forward to seeing how everything turns out; best of luck.
between school being over in less than a month, and me not supposed to be working on this in class ive had to lower my expectations on how the final outcome will look... sadly... unless i take the summer to plan and get parts.
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I found a huge collection of airsoft guns. Just visit https://www.airsoftnut.com/ and I'm sure you will get your favorite Airsoft gun at the best price.
You "found" it lol. More like you founded it.
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