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Posted: 10/25/2011 4:53:26 AM EDT
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Are LMT Enhanced Bolts undersize?
I have a S&W M&P 15, Douglas 16" match barrel mid-length, Surefire brake, H3 buffer. I installed a LMT Enhanced Bolt with McFarland gas ring in the M&P BC. The bolt seems very loose...sloppy loose! The gun functions perfectly, but I'm concerned about the bolt locking up the same way everytime. Accuracy seems fine so far. Do they just fit loose? Or, is something not right? |
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Thanks for the above responses.
I know it's working well, but I'm just not happy with the slop. If I have the upper off, I have to hold it barrel down or else the bolt and charging handle come flying out. I was thinking it fit very loose for a McFarland ring, they usually are very snug until you fire some rounds through it. That's probably the answer to this. I'll try the regular ring setup. Thanks again, Ron |
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The standard test for gas rings is to pull the BCG from the rifle. Ensure the bolt is extended from the carrier then place the bolt face down on a hard surface so that the carrier is suspended above the bolt. If the weight of the carrier causes it to fall down then the gas rings need replaced. From what you have said I would replace the mcfarland gas ring with a standard gas ring setup. |
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Okay, it was the McFarland. Replaced it with the standard 3 rings and now everthing feels as it should. That's the first problem I've had with McFarlands, and I've used them for a long time. Everything's going to crap these days.
Again, thanks to both of you for your time and advice. Regards, Ron |
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Quoted: This is not a correct test. Most carriers will fall long before the rings need replacing. The correct test as outlined in the TM9 fails the test if the bolt falls under it's own weight.The standard test for gas rings is to pull the BCG from the rifle. Ensure the bolt is extended from the carrier then place the bolt face down on a hard surface so that the carrier is suspended above the bolt. If the weight of the carrier causes it to fall down then the gas rings need replaced. From what you have said I would replace the mcfarland gas ring with a standard gas ring setup. Insert the bolt into the carrier and hold the carrier up with the bolt face pointing down, the bolt should not fall out of the carrier. Over time the test morphed into extending the bolt and placing the carrier on a hard surface and the bolt should not collapse into the carrier. That somehow got bastardized into the test you mention. (probably to sell more parts) If done your way the test outcome would be different depending on the weight of the carrier, a lighter carrier would pass the "test" where a heavier carrier would fail when performed on the same bolt with the same rings.  |
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