Many bolts now feature both, and it’s an easy enough DYI to retro-fix. The fix is easy enough-either a stouter spring or a “booster” insert.
AR15 EJECTOR MOD
I recommend this mod from the get-go on any carbine or pistol. However, increasing extractor pressure (so it holds tighter to the case rim) is about the only answer to getting some guns to work. Ultimately, the cure is reducing the level of gas pressure in the system, and that’s another article, or three, entirely. The real solution to solving extraction issues is in delaying bolt unlocking, and that’s a main function of increased-mass buffers and stouter buffer springs. Ultimately, taming the system operation cures all. If the extractor simply lost its grip on the case rim, then a tensioning trick is likely to solve your problems. Here’s a clue! If you see bent rims, take a look at the chamber. So, this is, and isn’t, the fault of the extractor. In this instance, we’re talking about fractional milliseconds. Keep (always) in mind that AR-15 gas operation points of progress are measured in milliseconds. The case is then kind of an immovable object because it’s still somewhat expanded and gripping the chamber walls. If the bolt unlocks too soon, the extractor tries to yank the case out of the chamber before it’s ready to leave. This article isn’t about those problems, but it is… Lemmeesplain: “shorter” gas systems, such as on carbine- and pistol-length barrels, along with the (increasingly) higher-pressure 5.56 NATO-spec ammo common now, create overly-quick function. Overall, extraction problems are common and that’s because of the additional stresses within the gas operating system in some platforms. That’s an accuracy issue, not a function issue. Don’t run a combination! If extractor tension gets too high, it doesn’t hurt extraction, but it hammers the case head as the round is chambered. More extreme: the case stays in the chamber and there’s a chunk missing from its rim! An extra-power spring, or effectively increasing spring pressure through adding a “booster” insert, will help prevent the extractor slipping slap off (and out) of the case rim groove.
Or, perhaps, the case reluctantly released but the extra drag slowed the carrier progress to the point it didn’t make a strong enough run to complete the cycle (and the case didn’t eject). What’s happened there is that the extractor lost its grip on the rim. One extreme symptom of faulty extraction is that the gun fires and the bolt comes back, and the case is still in the chamber. Its job is to pull a fired case out of the chamber. The extractor is essentially a spring-loaded claw that snaps over and into the rim of the cartridge case.
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