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Modify Cylinder Set - MP5A4/A5/SD5/SD6

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Old January 4th, 2009, 23:16   #1
Defcon_Carl
formerly carl05229
 
Join Date: Jul 2008
Location: Scarborough / Toronto
Modify Cylinder Set - MP5A4/A5/SD5/SD6

Hey guys just wanted to give everyone who is planning on buying this set as an upgrade for their tm mp5. This set comes with:

Upgraded Cylinder
Upgraded Cylinder head
Polycarb piston
Polycarb piston head
Upgraded mp5 nozzle

The piston,piston head and nozzle are great and very nice however i did run into problems with the cylinder and cylinder head. When i first installed the parts I run everything with an s100 spring and to my surprise I was getting 240-250fps. I tried disassembling and reassembling again but still I got 240-250fps readings. I may have done this a dozen times and almost given up hope and thought that my s100 spring was a misfortunate spring.

Later this evening i tried a little experiment putting back the stock cylinder and cylinder head. Guess what? after just the first time putting it back together i got 330-340fps on the dot! I used the same spring as before and Im getting better fps, my conclusion is that the cylinder and cylinder head on this set is not compatible with a tm mp5j.

also on the side note, i tested the cylinder and cylinder head on an aftermath v2 gearbox and it wouldnt close properly. It seems that the cylinder head has slightly smaller holes on the side compared to stock cylinder heads.

Overall, id say that it is made of high quality steel and much better than any stock cylinder head, however it didnt fit right on my mp5 so im putting it away.

I was wondering if anyone had similar experiences with modify v2 cylinder and cylinder heads.

Carl
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Old January 4th, 2009, 23:19   #2
ShelledPants
 
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Location: Toronto, On
I would like to counter this:

I have the modify FTK in my M4 and it's brilliant.

Did you lube the cylinder head o-rings, cylinder, piston head o-rings, and inside the nozzle? You have to lube it with cylinder oil, I don't know what it is but I don't think it's silicone oil. I use the G&P oil set from redwolf.
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Old January 4th, 2009, 23:22   #3
Defcon_Carl
formerly carl05229
 
Join Date: Jul 2008
Location: Scarborough / Toronto
Quote:
Originally Posted by ShelledPants View Post
I would like to counter this:

I have the modify FTK in my M4 and it's brilliant.

Did you lube the cylinder head o-rings, cylinder, piston head o-rings, and inside the nozzle? You have to lube it with cylinder oil, I don't know what it is but I don't think it's silicone oil. I use the G&P oil set from redwolf.
tried it on an mp5? I have the same on my m4 and it works like a charm. its my mp5 thats having issues I did lube everything before installing and gotten the same results. my stock cylinder and cylinder head didnt even have lube in them and shot perfect and better than the upgraded one.
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Old January 4th, 2009, 23:27   #4
ShelledPants
 
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It shouldn't matter, the MP5 is Version 2, so is the M4. The cylinders are identical, though there may be differences in the cylinder head, and there are definitely differences in the nozzle. I'm not saying that there might not be something wrong with that particular set, or even your gun's mechbox alignment.

But you're right, I have not tried this on an MP5, I was just making suggestions.
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Old January 4th, 2009, 23:28   #5
The Saint
 
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Location: Quebec
Carl05229, it could be that your cheap Broxa MP5 is somewhat off spec, resulting in poor fit with aftermarket upgrades meant for mechboxes with better tolerances.
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Old January 4th, 2009, 23:37   #6
Defcon_Carl
formerly carl05229
 
Join Date: Jul 2008
Location: Scarborough / Toronto
fitment issue for a clone mechbox is very possible. i had spring guides and tappet plate issues before with clones. I did not have fitment issues with my TM, just low fps readings in comparison to the stock parts. by all means I'm not saying this is a bad product. just wanted to hear out if anyone had similar issues with this upgrade.
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Old January 5th, 2009, 09:46   #7
TriChrome
 
Join Date: Aug 2008
Location: New Jersey, USA
I was one of the original testers of their cylinder sets about 2 years ago, and they sent me a bore-up set (cylinder, cylinder head, piston head, nozzle, 2x springs). Ran beautifully in my M4 and my m249, and as far as I know it's still running 2 years later in the gun I sold them with. I have no clue if their QC has dropped since Echo 1 became their main US supplier though.
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