Deep Firing Pin Strikes

[eewa]

Wolf hammer spring

 

Deep hammer strikes

 

Due to Deep primer strikes I was going to change out the hammer spring and noticed the following:

 

Wolf Hammer Spring

· Longer in length than Numrich purchased spring

· Due to larger spring diameter have to force into hammer hole

 

Numrich Hammer Spring

· Shorter in length than Wolf purchased spring

· Fits into hammer hole without forcing

 

Please provide your thoughts

 

Thanks

[Springman]

Curious, what sort of problem are you experiencing from the deep strikes? Is the firing pin puncturing the primer? Jamming?

[eewa]

Springman,

 

No the deep primer strikes are not puncturing the primer but deep enough that am concerned

 

I previously filled down the firing pin (Hammer end)

Presently

When hammer end of firing pin is flush with bolt the striking end of the firing pin is just below the face of the bolt

 

Ran 80 rounds with no failures other than deep primer strikes

 

While cleaning the gun I compared the active hammer spring ( Note - This spring has to be forced into the hole of the hammer) with hammer springs that I had purchased from Wolf and Numrich:

Findings

Wolf hammer springs are larger in diameter and longer in length

Numrich hammer springs are smaller in diameter and shorter in length

 

My thoughts are by reducing the amount of hammer force will reduce the deep primer strikes and also be less fatigue on the bolt, which possibly contributes to the bolts failure

 

All

Input would be appreciated

 

Springman

 

Keep in mind that the bolt I sent to you today has not be modified

The sent bolt is compiled as follows:

Bolt

Used firing pin spring

Used firing pin – previously bent and realigned by a machinist

Firing pin retainer

 

Thanks

 

eewa

[eewa]

Springman,

 

Revision

 

Keep in mind that the bolt I sent to you yesterday has not been modified

The sent bolt is compiled as follows:

Bolt

Extractor with screw – not fitted or tightened

Used firing pin spring

Used firing pin – previously bent and realigned by a machinist

Firing pin retainer

 

Thanks

 

eewa

[Springman]

Springman,

 

Revision

 

Keep in mind that the bolt I sent to you yesterday has not been modified

The sent bolt is compiled as follows:

Bolt

Extractor with screw – not fitted or tightened

Used firing pin spring

Used firing pin – previously bent and realigned by a machinist

Firing pin retainer

 

Thanks

 

eewa

Thanks Eddie, how much material was removed from hammer end of your firing pin? Sounds like the first 80 rounds like the modification.

[eewa]

Springman,

 

Didn’t do a before and after, very little material was removed from sticker end of firing pin.

 

Yes, running very well with no feeding issues.

 

Tomorrow will test with the smaller diameter hammer spring

[eewa]

Range Report

 

With Numrich hammer spring, which is, smaller in diameter and shorter in length than the Wolf hammer spring.

 

Ran 3 magazines loaded with 15 rounds each. Per magazine would fire three in semi mode and remaining in short round bursts. Gun performed flawlessly.

 

The previous deep primer strikes have been slightly reduced

 

Input would be appreciated

 

Thanks

[emmagee1917]

A collapsed coil spring is larger in diam than a not - so- collapsed spring ( IIRC ) . I would be afraid of the Wolf putting undue pressure on the center rod . IE . , the Numrich fits and works , so use it .

Chris

[eewa]

Chris,

 

The spring comparison was done while the springs were in a relaxed state. Three new Wolf springs were compared to two new Numerich springs

 

Appreciate your pervious input

 

Thanks

[emmagee1917]

I am aware of that , you couldn't compare them in the middle of a firing cycle .

I am saying that both work , so use the one that has less chance of causing problems down the road .

I used a Woff and ended up snapping the guide post off of an end cap . It could have been the spring or it could have been the one piece cap . I went with the two piece after that and a standard spring and no more problems from that area .

Chris

[eewa]

Chris,

Just curious, will your wolf hammer spring slid into your hammer without forcing?

[emmagee1917]

Don't recall , it's been years ago . I don't think it did , or at least I don't recall it . The post broke off at the base and worked it's way up into the spring . This allowed the base of the spring to wander into the path of the hammer and be smashed into the plug . Many shots later , the bolt jammed in the reciever from bits of plug between the bolt and receiver wall .

I lost the plug and spring , but I could have lost / damaged the hammer , bolt , and receiver , so I consider myself lucky .

I did get a 2nd Woff set , and again , I don't recall any fitting issues , it just stopped the gun from working . Too much spring pressure kept the gun from cycling . If I recall , I changed all the springs back except the under-barrel main spring .

Chris