ACS bolt Q?

[Maxx-Damage]

After i fire my gun and the bolt doesnt chop the pb, isnt it suppose to recock its self? Or is the bolt not broken in?

[vwjimmy]

Your marker should ALWAYS recock, weather the ACS bolt had to do its job or not...

[Jarhead]

Originally Posted by vwjimmy

Your marker should ALWAYS recock, weather the ACS bolt had to do its job or not...

That is not entirely true. The ACS bolt disengages and has to be recocked when it stops from chopping. The issue usually happens with full auto because the gun will outshhoot the hopper. Usualy this goes away with a upgraded hopper.
You may also have this problem if your bolt is not broken in. The easiest way to do this is, stick a swab in your feed tube and fire the gun around 500 times. I know this sounds weird but the spring is too tight and it really does work.

Please read the threads, there is alot of useful information there.

[Maxx-Damage]

Thanks jarhead after some searching i found this thread from Dragon. Ill try that since school starts tommarow for me

[vwjimmy]

Originally Posted by Jarhead

That is not entirely true. The ACS bolt disengages and has to be recocked when it stops from chopping. The issue usually happens with full auto because the gun will outshhoot the hopper. Usualy this goes away with a upgraded hopper.
You may also have this problem if your bolt is not broken in. The easiest way to do this is, stick a swab in your feed tube and fire the gun around 500 times. I know this sounds weird but the spring is too tight and it really does work.

Please read the threads, there is alot of useful information there.

IT IS TRUE!!!! The striker returns to the 'cocked' position, held back by the sear reguardless of the position of the frt half of the ACS. The ACS bolt is capible of compressing to prevent a 'chop' but cannot elongate itself to obscure the breech when the marker is cocked, nor can it stop the striker from returning. Air pressure forces the striker, and therefore the bolt, back into the cocked position when fired. This is the basic principle of the "Blowback" design. The lower tube, valve and frame on an ACS equpted marker has no clue as to which bolt is installed in it, no capibility of staying 'uncocked' on purpose. There are several possible causes for your marker not recocking but none of them have to do with the ACS bolt. The most probable of which, in your case, is that the marker is incapble of recharging fast enough to provide a recocking charge to the valve under heavy automatic firing. Also, the striker o ring may be freezing up or drying out allowing recock gasses to pass in amounts large ennough to prevent recocking. Hope this helps!

[jimbo001]

"There are several possible causes for your marker not recocking but none of them have to do with the ACS bolt".

Ahh.... actually vwjimmy, his marker failing to recock could have everything to do with his ACS bolt. When the bolt is new the internal bolt spring is too stiff to allow the striker to travel far forword enough to engage the valve pin if the bolt is stopped at the feed port by a ball that has not fully dropped into the breech. If the striker does not engage the valve pin there is no air discharge to blow the bolt back to the cocked position. Breaking in the internal bolt spring "weakens" the spring allowing it to fully compress when the bolt is suddenly stopped at the feed port by a misfeed. The bolt spring must compress enough to allow the striker to move forword far enough to hit the valve pin to cycle the bolt back to the cocked position. That is why it's called a "blow back" marker. In orher words, the main spring pushing the striker must be able to overcome the ACS springs' "resistence to compress" when the bolt is lodged against a missfeed at the feed port. Therefore, a stronger main spring pushing the striker forword allows the striker to "reach" the valve pin activating a gas discharge which in turn blows the striker and bolt back to the cocked position. That is why "breaking in" the ACS spring (making it weaker, compared to the main spring) greatly reduces and sometimes eliminates the "uncocking" problem.
I have proven this to be true with my MR2. At first I had the same uncocking problem you hear so much about in the forums. I did the bolt breakin procedure by first leaving the ACS spring completly compressed for about 4 days. was not much better. Then I manually cycled the bolt spring about 2000 times. It would now accasionally recock if I would stop (jam) the bolt at about 2/3eds into the feed port opening. I then installed the TRINITY RED main spring behind the striker, screwed in the velocity screw until the bolt would recock even with the top bolt stopped (jammed) at the begining of the feed port opening! If you are wondering about the velocity with this set up because of the heavy main spring, it shoots about 270 -280 fps. Right on the money. That is how I got my MR2 to work as designed. The trick to the proper function of the ACS bolt lies in the relitive spring pressures of the MAIN SPRING compared to that of the ACS spring. SOFTEN UP THE ACS SPRING.....BEEF UP THE MAIN SPRING. IT WORKS!