Lr308 bolt? ar10 bolt?

[pokey]

Out of the bolt carrier how do you tell the difference between a ar10 and a lr 308 bolt.  How would you know it a previous owner installed the correct bolt in the carrier.

[survivalshop]

 Armalite AR 10 BCG has a spring loaded Firing Pin . DPMS LR type has a floating Firing Pin like the AR 15 .

Edited January 8, 2017 by survivalshop

[blue109]

I think he's asking about the bolt specifically....how to tell the difference between LR and AR10.

I don't think you can tell visually. If I remember correctly, people have measured out tiny headspace difference between the two. If your gun checks out, you should be GTG.

If it's an aftermarket bolt with any mfg markings on it, it's probably DPMS pattern. not too many people making AR10 bolts other than armalite.

Edited January 8, 2017 by blue109

[survivalshop]

 Well I take it back , the original AR 10 Schematic don't show a Firing Pin Spring . It is shown on their manual now a days as  Part # EA 1011.

 As said above, if the Chamber Head Spaces properly for whats stamped on the Barrel , it should be good to go .