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Old 05-24-2014, 09:52 PM   #1
Young Gun
 
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Location: Paso Robles, CA
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Classic army m24 project!

Picked up a classic army m24 used that needs done work but decided to start a build thread to get the ball rolling.
The cocking lever has the notorious missing ball bearings and springs so a new one is in the mail from overseas. Great start for the platform.
Upgrades are as follows:

Prometheus aeg cut 6.01mm 590mm barrel

Firefly hard bucking

Barrel spacers

Pdi spring unknown placing at 469fps


Aftermarket m24 brake

Eye candy with new bipod and exhausting scope


Broken bolt


Upgraded barrel. Looks like it wasn't properly covered during a paint job.




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Old 05-24-2014, 10:00 PM   #2
m14guy   m14guy is offline
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Subbing. I'm interested to see where this goes.
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Old 05-25-2014, 09:09 PM   #3
Young Gun
 
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Classic army m24 project!

Project update.
So today I ripped apart the receiver to check my trigger group for wear or broken or cracked sears. So far that looked good to continue using. Classic army provides an adjustable trigger pull as well. I set mine at 2.3lbs on my trigger scale for a very clean and crisp break.



Cylinder components stripped:

P.O. Says the kit was a classic army 300% upgrade kit. Doing homework now.

Next was the cylinder. My compression was putting .20g rounds at 469fps as my previous post showed. Upon inspection it showed my cylinder head/nozzle is extremely worn. Lots of damage and dents. Orings however looked fine and still gave great seal.



The inside of the cylinder had some major scoring and ring marks leading me to believe that the incorrect piston was used, but after inspecting the spring guide there was a Home Depot styled lock washer below the nylon washer. This must have been installed by a previous owner in an attempt to mildly boost fps, but I think in reality it was causing the spring to slightly push the piston into the cylinder wall on one side. The small circular rings are where the scoring begins.

The makeshift spacer :/


Piston however had no scuffs or sharp edges near the oring so it should be totally reusable.


Spring guide measured out at 9mm so it is the model I want to keep in it. Saves me a couple bucks :)


Took measurements of the detent holes to replace the ball bearings and springs until my new cocking lever arrives. Looks like 2.6-2.7mm is the key


So I removed the lock washer and did my best to polish out the scuffs in my cylinder with a buffing compound and microfiber towel, and re-lubricated my cylinder/piston head to test out what my velocity would now be reading. I expected an increase from the grittiness of removing my piston from the cylinder I could tell needed a thorough cleaning, but that washer being removed would also drop it a hair, so was pleased to see 501fps with .20g rounds pop up on my chrono.


Finally I figured I want to add a personal touch to her since she's staying in my possession for awhile. Sanded all of the old paint and texturing off for a smooth finish like my choate stock.



Finished it out with nice even coat of rustoleum khaki as my base. As of now still unsure if I'm going to add any other colors.


Next on the list:

New cylinder head, probably a pdi.

New pdi spring to push 540fps

Possibly a new cylinder based on whether or not I can get all of the scoring inside removed completely with more time and patience.

Goal is to have her consistently hitting 300ft with either .40g or .43g bbs.
Stay tuned! Hop and barrel tuning to follow with tdc mod and rhop.



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Last edited by Sovereign08; 05-26-2014 at 07:54 AM.
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Old 05-25-2014, 10:28 PM   #4
m14guy   m14guy is offline
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Not bad... not bad at all. I love the paint job so far. The only think that was kinda weird is that grease in the trigger box. Besides that, I think it looks pretty good.

Also, adding some green or brown to the khaki paint job would look great :)
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Old 05-27-2014, 03:21 PM   #5
Chaz   Chaz is offline
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take the safety off the trigger box and put a stronger return spring inside.
TDC is butter on the M24. That way you can adjust on the fly and not have to worry about mag out, allen key in, mag in, not quite right, repeat, headache :)

I love my M24
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CA M24 Specs
PDI Cylinder w/ Modify SS Cylinder head
Modify Piston w/ Guarder Piston Head
Modify Bearing Spring Guide w/ Laylax spring
R-Hop w/ foam nub
Madbull Tightbore barrel
TDC mod
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Old 05-29-2014, 01:00 AM   #6
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Classic army m24 project!

Well the tdc is next on the list, and removed the safety as it kind of just flopped around anyway lol. Return spring will be looked into. Got the hop and barrel stripped down today. Barrel turns out to be a jbu 6.01mm, not a prommy :(

And to top it off, painted because of improper taping.


Drill, cleaning rod and some silicone Teflon mixture polished it right out though.
Regardless I have plans for a Tokyo marui psg1 barrel I'm going to polish and coat anyway now that prommy is out of the question haha.

So upon dissasembly I saw that there was some terrible work done on my hop arm.


Took my trusty hand file to it to round it out evenly as best as possible before searching out another avenue to correct this issue.



Pics make it a bit hard to see; my iPhone didn't want to focus well on the armature, so hopefully you guys can still see the before and after.
Upon testing, the arm now has too much material removed to effectively apply hop with the provided nub, so I'm in a debate as to cut a custom flat hop nub to pair with a lonex 70 bucking inner shaved, or to adapt one of the hs5 flat hop nubs I have lying around. For the time being I want to see the difference between shaved bucking and non shaved, so I'll be leaving the bucking stock for now during initial testing.


Next step is to tdc the hop up unit and get my pdi cylinder kit installed. Already picked up some of the bbwarz .36g, .40 and .43g rounds I'll be using to test after completion.
Until the next update I slapped the body back together for storage until I can get time to cut out a nub and tdc this badboy! Enjoy :)




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Last edited by Sovereign08; 05-29-2014 at 01:03 AM.
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Old 06-03-2014, 01:15 PM   #7
Young Gun
 
Join Date: Aug 2013
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Nice! I have a similar setup but with stock air parts.

Here is what I am at to date:
  • Prometheus 6.03mm 550mm inner
  • Same CA barrel break as you
  • Prometheus Purple bucking, sanded and treated appropriately, with teflon tape for seal
  • Teflon tape on piston head threads
  • RHOP
  • Stock hop-up chamber with a bored out section for clerance on TDC screw
  • Shimmed hop arm
  • TDC using jbweld and a brass nut and bolt with a fashioned brass thumb screw and a soft rubber grommet for pretty supple resistance
  • Stock cylinder, piston, head and spring guide

I had to cut 6 winds off the stock spring to bring my FPS under 500 with a variance of +/- 1 FPS. The air seal is fantastic.

I am currently using King Arms .40g BBs. I have an effective range of just over 300 feet.
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Old 06-04-2014, 11:14 PM   #8
Young Gun
 
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Classic army m24 project!

That's a big fps number for the stock spring. How many joules is that putting out? How are you liking the rhop in that chamber? I'm most likely dropping one in once I get my hop arm machined and shimmed. Still going to try out the lonex bucking stock, then shave the nub, then rhop with details on the performance differences in this build thread.

As of right now I'm still looking for a stock tokyo marui barrel between 410 and 490mm that I can polish out and use in conjunction with either .40g or .43g bbs. Really excited to get her done, but at the moment my wedding is postponing the cylinder kit, and I have a build order I need to fill with Careful on here lol. A bit more important at the moment.


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Old 02-20-2015, 10:56 PM   #9
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The rifles looking good man, well done.
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