Home CMMG How to Assemble AR15 Lower Receiver | PSA AR15 Build

How to Assemble AR15 Lower Receiver | PSA AR15 Build

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In this video, I walk you through how to install a Palmetto State Armory Lower Parts Kit on a PSA AR lower receiver. I hope this is helpful!

✅🔗 Parts List for Build

🚨TacPack code: 1stShot

🔧 What You’ll Learn in This Video:
✅ Tools you’ll need to build your lower
✅ How to install your trigger, safety selector, mag release, and more
✅ Pro tips to avoid common mistakes (like launching springs across the room)
✅ How to complete your PSA lower with confidence

This build uses all Palmetto State Armory components, making it a great platform for budget-friendly and reliable AR builds.

🔹 Instagram: @brian.1st

Timestamps:
00:00 – Parts Overview
02:31 – Mag Release/Catch
05:26 – Front Take Down Pin
08:06 – Bolt Catch Release
10:50 – Trigger
15:40 – Safety & Grip
19:00 – Buffer Tube

#AR15Build #howto #LowerReceiverAssembly #PalmettoStateArmory #1stShotTactical #GunDIY #ARBuilds #2AContent

WARNING!
1st Shot Tactical videos are filmed on a private shooting range in a controlled setting under the supervision of trained professionals.1st Shot Tactical videos are for entertainment & educational purposes only. Do not attempt to recreate or mimic anything seen in 1st Shot Tactical videos. 1st Shot Tactical will not be held liable for any injury to yourself, others, or property resulting from attempting anything shown in 1st Shot Tactical videos.

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32 COMMENTS

  1. I can still remember when I assembled my first AR lower and needing to watch a vid like yours step by step. Took nearly an hour lol.

    Cheers 🍻 👏🏽

  2. Will this same kit in a different upper (like a quad rail) work the same with the lower? Is it compatible or do I have to get your same upper and kit to make it work?

  3. Grab a set of Grace roll pin punches & roll pin starters. 100x easier.

    For the trigger roll pin, it's a good idea to have some support under the bottom of the trigger guard housing – Way too easy to snap one of those "ears" off if the pin doesn't line up 100%.

  4. Good video, thanks. A 1/4" x 2" clevis pin can be bought from Home Depot for a buck fifty. Use it and a small diameter punch in lieu of the $20 pivot pin tool. Weren't you worried about breaking an ear off your lower installing the trigger roll pin, ear unsupported? Can't believe the U-tube overlords haven't blackballed you yet! LOL! Keep up the great videos!

  5. Dude you always make some of the best gun content on here and I just wanted to say you're awesome for making vids like this. Videos like this are extremely helpful and make it so much less frustrating especially for people just starting out. Glad I subbed awhile back and look forward to more of your content man!

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