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Posted: 9/30/2008 9:56:51 AM EDT
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I pulled the barrel off a factory Bushmaster last week to replace with something different as my tastes have changed. There didn't seem to be ANY grease on the upper receiver threads. No damage of any kind. The threads all look fine, just no grease visible. Is this common? |
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Since the barrel, barrel nut, and upper fit very closely, and that area is under a LOT of temperature and pressure loads, it's quite possible that the small amount of grease used in the manufacture of your upper had flowed, cooked, and otherwise been modified by its environment to the point that you didn't see or feel it. I changed out the barrel on an Rock River upper a few months back, and I KNOW they put grease on it when they assembled it, but it was not obvious. As for how much you use, a small amount is all that's needed. It really only takes a tiny bit, either on the threads or the chamber. The excess will extrude inside and outside the upper and you can wipe off what you can get at-the rest will cook off as you fire the rifle. |
If it helps any I just pulled 2 stags apart and neither had grease only a light coat of machine oil was there. This is the number 1 reason I always pull mine all the way down and rebuild them. You just never know. Also the last 1 from model one sales was the same only no oil. It broke the FFT nut and barrel wench trying to get it off. Not cool IMHO. That is also why I will never do business with them again. They actually told me that there was no need for the grease and if I wanted it in a different configuration I should have ordered as such.  ETA the grease is for the threads under the barrel nut. It keeps it from locking up. A little will go a long way. I always us a liberal amount but thats me. They also come apart easy as pie if the threads have a liberal coat. You can put it on the extension as it does help ease the barrel out of the receiver while viced. However if you notice the barrel wont just pull out freely you are most likely using a vice block and need to loosen the vice up. Then the barrel will pull free. |
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