S&T PDI M40A5 (Is it really worth it?) - Airsoft Sniper Forum
       

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Old 09-22-2018, 09:36 PM   #1
Young Gun
 
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S&T PDI M40A5 (Is it really worth it?)




The over all length of the rifle is just under 4 feet.

The Barrel:

The stock inner barrel length is 371mm






The Hop Up:

This is a PDI Hop Up with two arms. there is no spacer between the arms so they seem to lean towards one side of the nub. The screws used push the arms up while the band pushes them down, so as you tighten the screws, you reduce the hop, and as you loosen the screws, you increase the hop.

The hop up is 110.5 mm long and 22 mm wide

The "Action Army Hop Up L96 Chamber" is compatible with modification. This information was provided by Wawan, and can be found in this thread, post 56







This is a picture of the stock O-ring and nub used in the hop up.



The Chamber:

It seems like the chamber itself is metal, but the piston and guide rod are both plastic. The seal is really bad straight out of the box, and couldn't hold air in the slightest. I got plumbers tape on the nozzle threads, and added a small second o-ring under the first. I can hold air for over a minute, which should be plenty.

The chamber is 292mm in length and 24mm wide






The Trigger:

The trigger seems to be decent. Metal construction with a 90 degree trigger system.




Ending Thoughts:

The Cylinder:Barrel ratio is sitting at about 4/1 out of the box

It recently came to my attention that the M40A3 version of this gun, and the Cyma cm.700 are pretty much the exact same gun. I have managed to find some really good resources here in the forums after realizing this (Thanks you Wawan!)


Useful Links:

Threshold's Thread on the Cyma
Edward Shawn has a good disassembly video here

(If you are a threads owner and you want me to remove your thread, let me know and I will take it off)

I am going to try to continue upgrading this gun, but it will probably be slow going, seeing as I am still trying to figure out what I can use, if anything, to replace things. (Like those plastic guide rod and piston) I will try to add the measurements within the next week or two. I will also get a picture of the rifle put together and some of the other features (?)

If anyone has any suggestions, I am all ears.
kazuchan and Thenoobatsniping like this.

Last edited by Kindering; 10-06-2018 at 12:57 AM. Reason: Additional content
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Old 10-01-2018, 10:10 AM   #2
Wawan   Wawan is offline
Young Gun
 
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You can use Action Army hop up chamber type 96 for this rifle.
Check this below link, page 6

https://www.airsoftsniperforum.com/s...ad.php?t=25369
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Old 10-02-2018, 12:22 AM   #3
Young Gun
 
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Quote:
Originally Posted by Wawan View Post
You can use Action Army hop up chamber type 96 for this rifle.
Check this below link, page 6

https://www.airsoftsniperforum.com/s...ad.php?t=25369
Thanks! I was actually looking for a hop up unit to switch out. I appreciate it!

Also, I will try to have measurements for all the parts up tomorrow.
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Old 10-06-2018, 12:12 AM   #4
Young Gun
 
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So here is an update. I changed some of the main post as well. Now, I have added a few modifications to my rifle to try and see if I can get some improvements. I have added plumber's tape to the threads on the nozzle head and added a second o-ring under the original, loose one that came stock on the piston. This helped me seal the chamber so it can hold air. I also did some work on the hop up. I made a nub from an eraser that is taller than the stock one, added a smaller o-ring to try to get more hop out of the chamber, and added some plumbers tape on the bucking to help seal the unit.

Those are basic things, the next I'm not sure if it helps anything at all. I placed spacers in the hop up arms, to spread them apart so they are no longer being pushed together on a single side of the hop up chamber. I am hoping this spreads where the pressure is being applied to the bucking, and helps the bb's fly straighter.




Also, the images are all resizing to a decent size for me, but if anyone is getting gigantic pictures, let me know and I will fix them.

Last edited by Kindering; 10-06-2018 at 01:08 AM. Reason: Grammer
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