Right tools and correct method make putting an AR lower together a snap.


In regards to roll pins, if you insert them in a drill and spin bevel the leading edge out corners that is going to be driving forward, this keeps the pin running true with the channel, and no leading edge burs to scrap down the channel to cause build up to accumulate on the tip of the pin.


As for pushing the bolt catch roll pin out of the channel from the front now that is leading edge wedge semi in place in the channel, again quality long shaft punches will no bend or break on you.  Plus, give you the needed reach against a tape up side receiver so your not scratching the hell of the receiver as well.

Not a fan of short punches for the roll pin for the bolt catch, since it too easy to scrap the hell out of the side of the receiver with the punch; even with the side taped to try to prevent such.  Plus, since you can stay straight with the back of the roll pin on a short punch since your trying not to scrap the receiver with it, it's too easy to angle pressure the back of the  pin to cause problems of it not being driving in straight through the channel as well.

So once the pin leading edge of the roll pin has been drill spun slightly radius and clean up so it will drive cleanly straight through, then long Roll pin retainer punch is  first use to start the pin in the channel and keep is driving straight, then will come back with a long roll pin punch to finish driving the roll pin in place the last of the way.

At 6:00, he's fluting with disaster with the short punches driving the roll pin in place, and chancing striking the back of the receiver with the hammer.

Yep, ideally the end tapers on the roll pins would be ideal, but more often you end up with a roll pin that the end tapers are more of a nightmare instead (read going to just scrap the metal out of the inside of the channel to end up causing a build up between the tip of it, and the channel it trying to being driving down cleanly).

Roll pin that you know is going to cause you nothing but problems is not cleaned up.


Verses a roll pin that does not need to be cleaned up isntead.


As for the bluing that your going to end up removing off the steel  roll pin tip, and even the back of it as you are driving it in, a quick touch up  Super blue will look like the pin was never touched in the first place.


As for any marks in the aluminum parts, aluminum black has you covered on these.


On both, Q tip with acetone to first de-grease the areas before you use the solutions to re-blacken such.