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Posted: 3/15/2012 12:11:25 PM EDT
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I just recieved my me Bolt carrier group from Bravo Company today. My question is that it came with a seperate o-ring and my friend and I can't figure out where it goes. He said it goes on the inside but he don't remember where. Any help would be appreciated... |
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Quoted:
It is used to "Tune" the extractor. The best thing you can do is throw it away, but that is just my opinion. I wouldn't throw it away, just stash it your range bag or spare parts kit. OP, the O-ring slides around the extractor spring. It increases the extractor spring tension. It was a field modification done as part of the SOPMOD program (IIRC) to mitigate failures to extract under the harsh recoil of the carbine gas system. the BCM bolts already come with a heavy duty/extra tension extractor spring. If you install it now, you'll most likely have too much extractor tension and that could cause issues and unnecessary wear on the bolt/extractor. I recommend keeping it with you, because sometime between a few thousand rounds and total bolt failure, the extractor spring could weaken over time and cause issues. Adding the O-ring as a workaround to improve tension would save you a wasted trip to the range and keep your gun functioning until you can purchase a new extractor spring. |
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