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Posted: 8/1/2011 10:36:58 PM EDT
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Got a Remington 742 Carbine where the gas block has seperated from the barrel. Looks as if it was JB Welded on from the factory. No damage or deformity to the BBL or Block. Bore Scoped the BBl and all is good. Question is how to repair it? JB Weld, Silver solder, TIG/MIG weld? I've never seen this before and am at a loss. Been smithing for almost 15 years and never seen this sort of issue on a 742/700. Any insight would be great. |
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The 742 barrel lug (gas block) was high temperature brazed on at the factory.
Remington uses a brass alloy high-temp brazing compound that may look like JB Weld. I've never seen a 742 loose the lug but on occasion I've seen other brazed parts on Remington's fail, most often bolt handles on the 700 and barrel support rings on the 870. Depending on your equipment and precision brazing skills, you can either send it back to Remington for repair or you can silver braze (solder) it back on. You need real silver solder that melts around 1100 degrees, and the lug has to be perfectly aligned not only back and forth, but side to side, so the barrel lug aligns in all direction with the gas port and the gas tube assembly. There's is a risk of bore scaling or other damage to the barrel. |
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