Step by Step AR15 Lower Receiver Build Guide | Aero Precision M4E1 Lower

How can a person tell what caliber works with a particular lower?

I just used this video to put together my M4E1 Lower, very helpful and thank you very much. My one criticism would be to mention that if you had a drop-in trigger like my Rise Armament, you would want to install that BEFORE the safety selector. Otherwise, you'll have to undo the Grip and reinstall!

excellent video bro! I'l be building my lower this week some time and I'll be watching with you step by step as I get her done… thanks for the video man!

Helpful hint….Assemble inside a large (I use a 2 1/2 Gal) freezer or storage bag or any clear bag, that way if a spring goes flying….it stays in the bag.

THANKS!!!! Fuck yeah!! 1st build in <hour. Youre the man. I only had to start over once. Safety upside down can cause problems at end.

Either way, THANKS!

Thanks for the video. Does a PSA parts kit fit this?

Where can one buy ar 10 lower complete parts kit? That is decent quality?

Tip for front Take Down Pin Install: Use a 3/16 ball Allen wrench pushed through from the left side and a needle nose pliers to push your detent pin into your receiver. Push your Allen wrench into the left side and the curved part of the ball will hold the pin and spring and “roll” right out when you insert your Take Down pin in! Easy!

How important is it to grease the buffer tube threads for the castle nut?!

Life saver, thanks help alot!!!

Nice vid man

The inhalation after every sentence

Thanx man, your a great teacher!

Thank you for this video it made the process a breeze! I have a mil spec lower. I used a tiny bench vise to push in bolt release pin.

Question, sir, do any of the parts on a lower need any greasing or lubrication? How about on an upper besides the barrel nut? Also, I've heard that some parts have a coating from the factory that needs to be removed before assembly. If you could shed some light on these questions, that would be great. Thanks for the video!

Excellent instructions. Thank you fo the walk through. Easy to understand and follow. My only FUBAR was the magazine catch button was not threaded. I had to order another one. I was able to assemble everything else but the magazine release and bolt catch. Now a waiting game.

Sir, your video is just awesome. I can’t thank you enough. Such a well done, clearly explained tutorial. Your “style” is very calm and assuring.

Thank you so much. Video was super helpful with my project.

How do you own guns as a damn red coat

just built mine today, managed to kink 3 pivot pin springs hahahahhahaha, luckily had one left in my old anderson lower . thanks for the vid man