I'm 0 for 6 on promags. 1 for a mini 14 that sent the bolt on top of the half fed round and smashed the cases right in the middle. And 5 for my m&p 9 that the base plates pop off of and send the rounds falling and spring and follower flying. All five of them have had the base plates fall off at...
Tapco mags work great as long as you don't run m855. The nose of the bullet would catch the front of the magazine and cause a failure to feed almost every time. Could probably file the inside of the magazine down a touch and be just fine. Both the tapco mags I had for my mini did this and I sold...
Definitely don't buy pro mags. I bought five of them for my m&p and now every time I go to seat them in the pistol the base plate fly's off and sends all 17 rounds flying to the dirt. I like to call it the pro mag dump.
Buffer
Buffer spring
Buffer tube
Lower parts kit which includes:
Fire control group (trigger/hammer/etc)
Safety
Magazine release
Bolt hold open
Receiver pins
And all the little springs/detents/roll pins etc you need to put all that stuff on
Need a bolt and bolt carrier
Barrel nut
Barrel
Castle...
Well my AR isn't just a cheap build. Its got PSA, Daniel defense, and bcm parts in it. I just think the buffer spring I got from PSA was a little light. I'll find out next time I head to the range. But so far the gun has been picky about being dirty, cause it always runs fine after I clean it...