Description
The Lantac M-SPEC Upper Parts Kit is the small-parts package that gets a stripped AR-15 upper up and running or brings a worn one back to life. Lantac builds these components to the same military specifications the rest of its parts follow, using correct materials, heat treatments, and finishes so the pieces hold up to real use and repeated cycling. If you've ever had a dust cover spring pop loose or a forward assist that won't spring back, this is the kit that sorts it out.
Inside you get the two assemblies that tend to give builders and armorers the most grief: the ejection port cover setup and the forward assist. The ejection port cover, rod, and spring keep dirt and debris out of your action when the rifle is closed, and the forward assist assembly, spring, and roll pin give you that positive push to seat a stubborn round or bolt. These are the exact parts that ship missing on a bare upper receiver, so having a matched kit on the bench saves you from chasing down individual bits.
Where the M-SPEC Upper Parts Kit Earns Its Keep
The forward assist and ejection port cover are two of the trickier parts to install on an AR, mostly because the cover has to go on before the barrel and handguard in a lot of setups. Having quality components that seat cleanly and hold spring tension the first time makes that job a lot less frustrating. A little patience with the c-clip and rod, and you're set.
Built to Lantac's Standard
Lantac is known for machining and finishing that runs a notch above generic parts-bin hardware, and that carries over to their small parts. This kit is made in the USA and backed by a lifetime warranty, so whether you're finishing a fresh build or keeping a spare on hand for field repairs, you're getting components meant to last as long as the rifle they go in.
Key Specifications
- Manufacturer: Lantac USA
- Model: M-SPEC
- Manufacturer Part Number: 01-PKIT-UP
- UPC: 614347539750
- Product Type: Upper Parts Kit
- Platform: AR-15
- Color: Black
- Length: 3.8 in
- Country of Origin: Made in USA
- Warranty: Lifetime
What’s Included
- Ejection Port Cover
- Ejection Port Cover Rod
- Ejection Port Cover Spring
- Forward Assist Assembly
- Forward Assist Spring
- Forward Assist Roll Pin
Frequently Asked Questions
What does the Lantac M-SPEC Upper Parts Kit include?
The kit comes with the ejection port cover, cover rod, and cover spring, plus the forward assist assembly, forward assist spring, and forward assist roll pin. Together these are the small parts a bare AR-15 upper receiver needs to be complete. It covers both the dust cover setup and the forward assist in one package.
Will this kit fit a standard AR-15 upper receiver?
Yes, it's built to standard AR-15 dimensions and follows military specifications, so it drops into mil-spec uppers. If your receiver is machined to spec, these parts will seat correctly. It's a good match for finishing a stripped upper or replacing worn hardware.
Is the ejection port cover hard to install on this kit?
The ejection port cover is one of the fussier AR parts to install, mainly because it usually goes on before the barrel and handguard, and there's a small c-clip on the rod to manage. Slotting a thin card behind the rod as you work it in helps a lot, and taking your time with the spring tension keeps things from launching across the bench. Plenty of build videos walk through the exact sequence if you want a visual.
Do I need special tools to install the Lantac Upper Parts Kit?
You'll want a roll pin punch and a small hammer to set the forward assist roll pin, plus needle-nose pliers or a pick for the ejection port cover c-clip. Depending on your upper, the dust cover may need to go on before the barrel nut and handguard. Nothing exotic, but a basic armorer's punch set makes the job smoother.





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