Ruger American Ranch 556 vs LakeCity M855

[PORSCHE928S4]

I have a RAR in 556 and have been using Lake City M855 and has worked well but...... I had some light primer strikes. Does the M855 have a primer that is that hard I had two light stikes out of 50 the other day. I was just curious if anyone else had had an issue and it is normal or is it time for a customer service call ?

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[Stomper]

MILSPEC 5.56 and 7.62 NATO rifle rounds tend to have harder primers so they can also be used in machineguns.

 

[aljames]

MILSPEC 5.56 and 7.62 NATO rifle rounds tend to have harder primers so they can be also used in machineguns.

CCI #41 and #34 respectively.

 

[PORSCHE928S4]

The stuff runs in all of my AR's I thought there might be an issue with the rifle . Is there a tune up for the RAR that would remedy this ?

 

[Stomper]

The stuff runs in all of my AR's I thought there might be an issue with the rifle . Is there a tune up for the RAR that would remedy this ?

Stronger hammer spring, maybe.

 

[PORSCHE928S4]

I will have to look into that almost a must so I can use that ammo

 

[aljames]

Before I changed anything I would disassemble the bolt entirely and make sure it isnt loaded with Ruger's preservative grease.

 

[PORSCHE928S4]

I did't even think of that maybe there is some gunk thank you for the idea

 

[mhayd93]

This is a fairly common problem for bolt action 223/5.56 rifles. An AR-15 with a standard strength hammer spring hits with greater force. The margins for reliable ignition on hard primers seem to be much slimmer on bolt-actions.