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Discussion Starter · #1 ·
Alright, today I got a couple of upgrades and a new cylinder for my javelin m24, but it seems that when the guns safety is off, it slam fires. But, when I put the safety on it magically doesn't slam fire. Also it isn't fault of the cylinder, because this was still happening with the old one, which snapped in half. Any tips on how to fix this? I cant seem to find any info on it either. Please help!!!
 

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The safety just prevents the trigger from being pulled and keeps it from pivoting. When the piston is cocked, the 1st sear is pushing down hard on the trigger and any slight play will allow the sear to drop.

Put the old cylinder back in and try again. If the slam fire goes away, it would mean that the new piston may have a smaller diameter allowing the sear to release it prematurely.
 

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Look at the sears and see if you can find any wear. I don't know how much use you can get from this guide on slam firing, but I have the page open so take a look.
 

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Discussion Starter · #8 ·
Alright, after tweaking with it for a little while I have gotten rid of the slam firing problem somehow. But occasionally the guns bolt will pull all the way back the sear will catch, and the bolt then gets stuck like this and I have to use a lot of force to push it back in, and then I pull the trigger and it simply wont fire. I end up having to take the gun apart and take out the trigger box, causing it to fire.
 

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Every now and then I get the problem where it gets stuck all the way back. I found If you pull it back a bit farther it will correct itself.
 

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I have that exact problem on my M28 and found what caused it and fixed it.

Check your 2nd sear. Betcha the sides look chewed up and it can wiggle or flop side to side.

When you cock the bolt back and the piston engages the 2nd sear, it jams it either to the left of the cylinder slot.

That slot is punched out and has rough jagged edges that grabs the 2nd sear causing the stick. When you push the bolt handle forward the 2nd sear is forced downwards slightly allowing a piston slip giving you a slam.

I used 220 and the 400 grit to polish the slot edges and got rid of the slam.

My cylinder is so much smoother when I recock. Also check the inside of the receiver. casting burrs can cause sticks as well.
 
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