Slam fire?

[weirdharold]

I recently started shooting a FM Products SBR which has complete FM upper and lower. The problem is that the firing pin will strike the primer when the bolt is released. So far no slam fires, but this makes me very nervous. I stretched the firing pin spring which helped a little, but the primer strikes still occur. Has anyone had similar problems? Can I purchase a stiffer spring? If so where? I really like the rifle. It will run any ammo at 100%, but I am concerned about this issue.

[dauntedfuture]

ummm.   If the firing pin is striking the primer then the gun will go bang...  How are you not getting slam fires?  are you getting dimples on the primers?  that's different... and normal.   Is the hammer following the bolt when you release the bolt and hold the trigger?  what exactly is happening?

[weirdharold]

dauntedfuture,  

 

When the bolt is manually released with a cartridge in the chamber, the firing pin will "dimple" the primer. The hammer is never released.

 

 

 

 

 

[usmc1094]

That is normal for all ARs. Try it on another gun, it should do it also.

[weirdharold]

I forgot to mention that this is a 9mm PCC and the only thing keeping the firing pin away from the primer under these conditions is the firing pin spring.

 

Thanks for the comments guys.

[jerseyglock]

34 minutes ago, weirdharold said:

I forgot to mention that this is a 9mm PCC and the only thing keeping the firing pin away from the primer under these conditions is the firing pin spring.

 

Thanks for the comments guys.

 

What Weirdharold said ^. 

[jerseyglock]

3 hours ago, weirdharold said:

I recently started shooting a FM Products SBR which has complete FM upper and lower. The problem is that the firing pin will strike the primer when the bolt is released. So far no slam fires, but this makes me very nervous. I stretched the firing pin spring which helped a little, but the primer strikes still occur. Has anyone had similar problems? Can I purchase a stiffer spring? If so where? I really like the rifle. It will run any ammo at 100%, but I am concerned about this issue.

 

If you worry about slam fires go with small rifle primers. Just don't use Federal small pistol primers, primer wall is thinner.

[weirdharold]

jersey,

 

Unfortunately I just bought 10000 Federal small pistol primers for my handguns.

[jerseyglock]

2 minutes ago, weirdharold said:

jersey,

 

Unfortunately I just bought 10000 Federal small pistol primers for my handguns.

 

Use small rifle primers for PCC and save Federal for pistol loads.

[dauntedfuture]

Don't create solutions for problems that don't exist.  Your rifle is fine, I suspect, with ANY primer, pistol or rifle.  If the hammer is staying back, I don't think you will get a slam fire.  Go shoot and check back in if you do.  in the unlikely event that your rifle is not 100% fine, your not going to hurt anything.

[Darqusoull13]

19 hours ago, usmc1094 said:

That is normal for all ARs. Try it on another gun, it should do it also.

That's not at all normal on any of my GMR's. 

I'd suggest the OP contacts the manufacturer to discuss his concerns. 

[Patrick Scott]

Ive used two different manufactures of bolts and 3-4 of pins and springs in my PCC guns, never had this happen.  I'd send the company an email. 

[PewPewJohnson87]

I’ve noticed this in all my AR’s in various calibers(.223/5.56, .300BO, 6.8SPC, .308, .277 wolverine, 6.5CM). I have never looked at the primers forbmy PCC, so when I go home today I will check and see if it does it like all the others. 

[AHI]

Not normal for a PCC . look at your firing pin tip it may be bent thearfor sticking just enough to mark the primers.

[dmshozer1]

8 hours ago, dauntedfuture said:

Don't create solutions for problems that don't exist.  Your rifle is fine, I suspect, with ANY primer, pistol or rifle.  If the hammer is staying back, I don't think you will get a slam fire.  Go shoot and check back in if you do.  in the unlikely event that your rifle is not 100% fine, your not going to hurt anything.

Depends on where the gun is pointed when it goes off!

[PewPewJohnson87]

My PCC with Faxon BCG did not dimple the primer when I released the bolt from its locked position. might want to call the manufacture and see if that is "normal".

[usmc1094]

On 6/12/2019 at 1:24 PM, Darqusoull13 said:

My fault....I didn't realize I was in the pcc forum. Every ar in 223/556 does that, from the ones I used in the military to the ones I own now. 

 

That's not at all normal on any of my GMR's. 

I'd suggest the OP contacts the manufacturer to discuss his concerns. 

 

[Jeremyc_1999]

I had issues and changed the trigger to an oem trigger and that fixed the problem