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Posted: 1/19/2016 1:33:53 AM EDT
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When is one supposed to stone the bolt on an M60? According to Desert Ordnance, the new bolts and op rods, made for the E6, last longer. Does this bolt look like it needs stoning? This bolt has about 5,000 rounds through it. How does one stone a bolt?   |
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You run a blank or dummy round as the last round in your belts? My understanding is that this bolt lug damage is mostly caused by a bolt slamming home on an empty chamber. I run a blank as the final round on all my belts and after 5000 rounds the lugs look almost like new.
I can't tell how severe the damage is from your pictures. The SAR series on the M60 has some details on what to look for and what to stone. Joe |
| Ive never heard of "stoning" a bolt. I have a semi 60 and know a lot about the m60 design in general. The bolt doesnt appear to have any noticeable chipping or anything indicative of unserviceable wear, just missing park. Also, as a machinist, I find it hard to believe that the e6 bolt lasts longer than the previous incarnations. There's been no leap forward in an improved metallurgy since saco (ie the steels or heat treating process has not changed) If saco would have discovered a better material to make the bolt out of they would have (within reason, all production factors considered such as time and unit cost vs noticeable gain in performance). I would take multiple e1 or e3 bolts over a single e6 any day of the week. The more parts you can have for the 60 the better. But reverting back to your question, I think you are okay, 5k rounds is nothing for the 60 especially in semi auto. However if you are having stove piping issues then you should look at replacing your ejector spring. Feel free to PM me with any Q's. |
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Quoted:
You run a blank or dummy round as the last round in your belts? My understanding is that this bolt lug damage is mostly caused by a bolt slamming home on an empty chamber. I run a blank as the final round on all my belts and after 5000 rounds the lugs look almost like new. I can't tell how severe the damage is from your pictures. The SAR series on the M60 has some details on what to look for and what to stone. Joe I've never heard of the bolt causing damage slamming home on an empty chamber. Most of the damage we saw (M60Ds) was when the jackass let the bolt slam home with the barrel removed. It would then damage the receiver. We actually had to replace two of our M60Ds for that same reason. We got two "brand" new M60s that we had to convert to D spec. Both were packed in 1968 and re-packed in 1970 something. That was in the mid 1990's. |
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