Airsoft Sniper Forum banner
1 - 8 of 8 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
Hi all

2+ years ago I got a used CA M24, got a bit on the sniper craze, so when I heard this thing had a lot of upgrade parts in it already, I thought why not.

Sad story is it had a CA Advanced cylinder and CA Vacuum piston, 9mm guide, 13mm spring (Probably uprated too) and probably PDI hop up chamber (In brass/cupper finish, but it looks like PDI when I lay it all out and look at the PDI hop up manual) some o-rings were gone and despite replacing them and installing an expensive King Arms M3 scope I got terrible accuracy, so I havent really bothered with the rifle since.. Been using it for some quickie pot shots out the window now and then thats all.

Now that my interest in the rifle has picked up again, I`m a bit apprehensive towards going all out with upgrading it at this point, as I already paid quite a lot for it and already expected accuracy..

I put a new o-ring on the cylinder, and didnt install a new impact o-ring (Which did nothing anyway, right?)

With a 6.01 515 PDI inner barrel (8.55 outer diameter, and 2 spacers @ 8.55 inner diameter) you would have thought the thing would be pretty darn accurate, but every bb I fire hits differently.
5 bb`s spreads as much as over an inch at less than 15 yards, and sometimes I have to make MOA adjustments on the KA M3 scope for every shot.. 0 wind might I add..

Now, I have a few suspicions here..
1: Piston actually does need a impact o-ring, but at this stage I could might as well go for one of those cup pistons or w/e, but problem is, what piston should I look for? I`ve read about the Laylax Element 3 piston, but does it work with the M24? And where can I find the cups? Searched on WGC but cant find Guarder, Modify nor Laylax cups.

2: The hopup unit, the o-ring for the rubber arm is gone, the screws that goes in on each side to hold the barrel in place is gone too.. Theoretically, with each reload, the cylinder cap could possibly twist the barrel and hopup a little different each time, resulting in big spreads.. No?
Also the amount of spacers (only 2 pcs) could be a problem?


Theres also another problem with the broken bolt handle, but I put some paper between bolt handle and cylinder to help even the pressure when working the action so thats not my main concern right now, but then again it might very well twist the cylinder (And thus touch the barrel/hopup and change flight path, since the two screws that holds barrel in place in hopup unit is gone) a little when I work the action?

I dont have an understanding of how to get accuracy out of this airsoft, one thing is getting considerably better accuracy out of an AEG (I open and tune aeg gearboxes all the time), but from reading on this forum I understand that sniper airsofts are different, I`m in no way an expert nor am I here to start any arguments, I just wanna get this awesome looking gun rocking at long range engagements, hopefully with the wide array of knowledge on these boards :)
So therefore I came here to ask for help :)

Any suggestions from anyone who knows the ropes is appreciated :)
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #4 ·
Yeah it looks brassy, but the weird thing that I couldn`t shake is besides that it has the exact same anatomy as the PDI hop up unit.
But I deffo take your word for it!

Either way I need new screws and hop bar o-ring, wouldnt be a bad idea to go for a PDI one either way I guess, the inner barrel`s outter diameter is 8.55 so it should be a snug fit :)
Also getting another spacer, and a SPR 250% spring (To punish whats left of the Advanced cylinder )

Does anyone know a good piston I could buy that`ll not only fit inside the CA Advanced cylinder, but also in a PDI Palsonite VC M24 cylinder (When I can afford it) ?
The spring I ordered has a 13mm outside diameter, will it also fit the PDI Vacuum or Hard pistons?

Thank you so much for invaluable replies so far :)
 

·
Registered
Joined
·
909 Posts
The main difference between the stock chamber and the PDI is that the PDI chamber has 2 hop-up arms.

I would go for the PDI Hard Piston made for the APS2. I think that'll fit the stock cylinder, but I'm not sure. I've heard PDI stuff is a bit different in size, so you'll have to look that up. I went LayLax for the short time that I owned my M24.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #6 ·
Roger that!
I emailed x-fire the questions on dimensions, either way I figure I`ll just go for chamber, spacer and spring for now, and see if that does anything to accuracy before I do anything more specific with the internals other than alternating between the spring I have, and the SPR 250% spring, all though the current cylinder does have a bit too much slack in my opinion..
Thanks a lot for the advice :) Will be updating here when I get the new parts, cool to find out if hop up chamber and barrel are the only things needed to get good groupings :)
 

·
Premium Member
Joined
·
716 Posts
I've got tons of answers for you, but it won't be until later tonight/tomorrow.

BTW, the first gen PDI hop up was brass, not black. The way you can tell the difference between a stock unit and a PDI is the PDI will have 2 set screws underneath the cylinder head nozzle as well as 2 hop up arms on it.
 

·
Registered
Joined
·
5 Posts
Discussion Starter · #8 ·
Roger, my hop unit has 1 arm, so I guess that settles it either way, I can already imagine two hop up arms helping to keep a more even hop up bulge in the barrel.
Not to mention my stock unit misses the screws that holds the barrel centered so it`s about high time to swap it out either way :)
 
1 - 8 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top