Need help with Spikes ST-22

[Btango05]

I've been having problems with my st-22 double firing. I pull the trigger it fires, I release the trigger and it fires again. I do a functions check on trigger...pull trigger, hammer releases then I keep my finger on the trigger, lock the hammer back and release the trigger but the hammer does not release again. It was releasing before I replaced the disconnector and spring. It's very inconsistent when it happens. However today a bullet exploded in the breech and the lead got jammed in the barrel.



Has anyone else had this problem, maybe with other AR's?

No feeding issues or light strikes. Perhaps the hammer spring is too much for the .22? I've been reading up on trigger options for the ST-22, going with lighter hammer spring but I can't find them on Spikes.

Any suggestions?

[jpopfan]

Spike's ST-22 Tuning Guide

In particular, you should probably look at the Firing More than 1 Round section and the Firing Out of Battery section.

[Btango05]

Thanks, I've seen this but its not emptying mags auto firing. Just will dbl tap. If I hold the trigger the hammer stays locked, then I will let go of trigger and it will fire again. Then today the round fired then the second round fired out of battery causing the jam.

[dchang0]

Can you borrow another lower for testing? Just to rule out either the lower or the upper. Process of elimination...

[Btango05]

yeah im thinking about that. it may be the holes are misaligned on the lower causing this "fire on release" issue. I've been doing alot of studying and I've found threads on disconnecter timing.

Also it could be the way I'm pulling the trigger... I notice if I pull the trigger and slowly release it will fire again however if I pull the trigger....hold it....then abruptly release it will not fire. This is only in the case of functions check not actual live fire

[Chunky_lover]

that happened to me a few times, but the round made it through the barrel, this is when I was using a lighter hammer spring. After I switched to stock hammer spring all problems went away. Also it seemed after 5000 rounds the bolt got broken in better, I dont run any lube on it and my recoil spring has to be 6 coils shorter then what they want for the max shortness. I experimented with a stock recoil spring and all the problems came back.

Maybe check the hammer spring, order different types.

[Btango05]

that happened to me a few times, but the round made it through the barrel, this is when I was using a lighter hammer spring. After I switched to stock hammer spring all problems went away. Also it seemed after 5000 rounds the bolt got broken in better, I dont run any lube on it and my recoil spring has to be 6 coils shorter then what they want for the max shortness. I experimented with a stock recoil spring and all the problems came back.

Maybe check the hammer spring, order different types.

I will do that. Thanks!

[Btango05]

Follow up on issue....After exchanging numerous email with Tom from Spikes he figured it was my FCG or some component. He didn't come right out and say buy this and it will be fixed but after asking opinions on various FCG's he recommended JP Enterprises 4lb FCG.

Well I watched the vids on the site and got sort of leary about JP when it gets to the part of timing the disconnect. I'm fairly mechanical but I don't want to throw down almost $200 then F up the install and have to order new parts.

After reading numerous reviews about FCG's one particular model kept coming up as being worth every penny, Geissele FCG. So I ordered the service grade 3.5-5lb first stage and .5-1.5lb 2nd stage. From all the reviews I read its pretty much a no brainer install. Well it won't get here till Friday so I don't have any range reports.

But here's the funny thing...I had to go to the range today. I took the st-22 and I didn't have one fire on release. The gun operated flawlessly! In fact it was a good day for all my .22's. I ran about 30 rounds through my mosquito with no issues. I fired about 100 rounds with my GSG....no issues there. So I don't know what was going on when I started this post but for the moment I have a well functioning Spike's st-22.

Anyone else have good things to say about Geissele?

[Dragon]

My model 1 22 upper came with a hammer spring ,trigger spring, and disconect spring.

Do the Spikes's come with these?

[Btango05]

Not sure...? I bought my ST-22 complete with Spike's multi cal lower...RRA parts kit.

[CHS]

In my experience with AR-22's the BEST thing you can do for reliability is make sure you have a rounded hammer rather than a notched hammer, and run reduced-power springs. The JP spring kit is perfect for this and only $20 after shipping.

You should have flawless performance after this combo.

[Btango05]

In my experience with AR-22's the BEST thing you can do for reliability is make sure you have a rounded hammer rather than a notched hammer, and run reduced-power springs. The JP spring kit is perfect for this and only $20 after shipping.

You should have flawless performance after this combo.

Which kit? Can you post the link? I don't think this Geissele is gonna work for me. The hammer isn't notched but the striking surface is small so when I pull the bolt back I can feel a bit of resistance as the hammer is locked back. I've decided to just return it before I test it. I don't want something to go wrong and not be able to return it.

Spikes has the SSA triggers in stock...I've seen from other forums that these are proven winners in the ST-22.

[CHS]

Which kit? Can you post the link?

http://www.jprifles.com/buy.php?item=JPS3.5

The nice thing is, after installation you get about half the trigger pull just by swapping the springs. It's the cheapest trigger job you can do.

Be sure to put some grease on the disconnector hook on the hammer and the sear surfaces of both the hammer and trigger. Totally new feel and perfect reliability.