Help, Suggestions for new AR build

[les snyder]

once you have selected the trigger group... any of the sources for parts kits that are true "mil-spec" should work (and are typically advertised as such)... if you have never put in the detent spring for the hinge pin, I find it easier to insert a drill bit shank (the taper allows me to work a knife blade to compress the spring and plunger into the hole) to act as a slave to get the detent spring and plunger in, then put the hinge pin in ... some use the rear takedown pin, but the drill bit is longer and easier to manipulate for me.. if you use the takedown pin, make sure you do not get the groove near the plunger and trap the wrong pin

[twyacht]

This video was very helpful.

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pt. 2

Step by step, some helpful tweaks along the way.