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A stripped upper receiver is a blank canvas, but it won't do much until you get the forward assist and ejection port door installed. That is exactly what this Luth-AR A3 Upper Receiver Parts Kit handles. It bundles all the small pins, springs, and clips that tend to vanish under the workbench, so you can complete a fresh build or bring an older upper back to life without hunting down parts one at a time.
Inside you get the ejection port cover, ejection port rod, ejection port C-clip, and ejection port spring, along with the forward assist button, forward assist spring, and forward assist pin. That covers both jobs most builders run into on an A3-flattop upper. The parts are steel and made in the U.S.A., which matters when you are dealing with tiny components that take repeated spring tension and door slams over the life of the rifle.
This is a MIL-SPEC fit for standard AR-15 A3 upper receivers, so it drops into the vast majority of flattop uppers on the market. It shines during a ground-up build when your stripped upper shows up bare, but it is just as handy for repairs. If your ejection port door has a bent hinge pin, a worn spring that won't snap shut, or a forward assist that feels mushy, this kit lets you refresh the whole assembly instead of chasing individual pieces.
Installing the ejection port door and forward assist is a rite of passage for anyone learning to build ARs. A roll pin punch, a small hammer, and a bit of patience go a long way, since the ejection port rod and forward assist pin both want to fight you a little on the way in. Feedback from folks who have run these parts leans positive, with builders noting clean fitment and a finished look that matches the rest of the receiver. Luth-AR has been a trusted name in the AR world for decades, so you are getting dependable hardware for a foundational part of your build.
The kit comes with the ejection port cover, ejection port rod, ejection port C-clip, and ejection port spring, plus the forward assist button, spring, and pin. That gives you everything needed to install both the dust cover door and the forward assist on a stripped A3 upper. It is a complete set for those two assemblies rather than a full upper build kit.
It is built to MIL-SPEC dimensions and designed for standard AR-15 A3 flattop upper receivers, which covers the large majority of uppers out there. If your upper accepts a standard forward assist and ejection port door, these parts will drop right in. It is not intended for AR-10 or .308-pattern uppers, which use larger components.
A roll pin punch set and a small hammer will get you through the job. The ejection port rod and forward assist pin both take a little persuasion to seat, so a bench block and steady hands help a lot. Nothing here requires a gunsmith, and it is a common first build project for people new to the AR platform.
The components are steel and made in the U.S.A., and Luth-AR has been a well-known name in the AR world for decades. Builders who have used the kit report clean fitment and a finished appearance that blends in with the rest of the receiver. For a foundational part of your upper, it is dependable hardware at a sensible level.
| UPC | 859819007942 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | URPK-A3 |
| Product Type | Part |
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