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The bolt carrier group takes more abuse than just about any part of your AR-15. Every round sends it slamming back and forth, and over time the small internal parts start to show it. The DoubleStar Bolt Carrier Rebuild Kit gathers the wear items that tend to go first into a single package, so you can bring an aging bolt back to life without hunting down parts one at a time.
Inside you get one extractor, one extractor spring with bumper pad, a set of three gas rings, one O-ring, an extractor pin, a firing pin, a firing pin retaining pin, a gas key, and two gas key screws. That covers the parts most likely to wear out with round count. DoubleStar builds these from quality American-made steel rather than the metal injection molded stuff you find in bargain kits, which is a big reason they hold up shot after shot. The whole kit wears a matte black finish to match a standard mil-spec bolt.
Most folks start thinking about wear parts a few thousand rounds in. A quick bench test tells you a lot: stand the carrier up on the bolt, and if it collapses under its own weight, your gas rings are done. Weak or flattened extractor tension leads to failures to extract, and a tired spring can turn into short-stroking and stovepipes. Swapping in fresh gas rings, a new extractor, and a strong spring clears up the vast majority of mechanical hiccups on the platform. Keeping a firing pin and gas key hardware on hand rounds out the job.
This kit is a smart thing to have on the shelf whether you run a range gun hard or just want spares tucked in your kit before something acts up. A basic punch set and a little patience are all you need to get the work done at your own bench, and you'll know exactly what's inside your rifle when you're finished.
The kit comes with an extractor, an extractor spring with bumper pad, a set of three gas rings, an O-ring, an extractor pin, a firing pin, a firing pin retaining pin, a gas key, and two gas key screws. That's the full lineup of small wear parts that typically fail first in an AR-15 bolt. It gives you everything needed to refresh the internals in one go.
A common bench test is to stand the carrier upright resting on the extended bolt; if it collapses under its own weight, your gas rings are worn out. Weak extractor tension, short-stroking, or failures to extract are also signs the wear parts are due. Many people plan on swapping these items somewhere in the several-thousand-round range as routine maintenance.
Yes, the AR789 kit is built for standard AR-15 bolt carrier groups and uses the same dimensions as mil-spec parts. The matte black finish blends in with a typical phosphate or nitride bolt. If you're running a non-standard or proprietary BCG, it's worth double-checking your bolt design before ordering.
Not much. A basic AR punch set and a small hammer will handle the extractor pin and firing pin retaining pin, and the gas key screws just need proper torque and staking. When you reinstall the three gas rings, stagger the gaps so they don't line up, which keeps a good gas seal.
| UPC | 841348104063 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR789 |
| Product Type | Bolt Carrier Group Part |
| Color | Black |
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