First time at this fun project and I sent the little brass takedown detents flying twice in the garage. Found them both times. Yea! But last night the bolt catch detent spring took off across the garage and I looked for hours, the wife looked too, I looked again today and no luck finding that little item. Soooooo................my lower build has come to a halt, for now. Put in another order for the spring, some other parts for the upper and a oops kit of springs, pins and such. Went off to Kurts to see if they had the spring and I could not get near the place. Its a madhouse Zoo. No parking and lots double parked and a line out the door practicably. Went to harbor freight to pick up a spring kit to see if I could make one from their package. Nope....none were close to the size, plus if you drive in that roll pin the last thing you want to do is have to pull it out to replace a defective spring. Anyone have another source for small parts that are local, not mail-order. This time of year its taking forever to get parts from the parts houses, unless you want to pay big bucks for next day delivery. I am amazed at the traffic in the gun stores over the weekend. All the AR mags went poof at Fishermans. NW armory was packed. Its a mad race to get the guns before Feinstein or the President put a halt on the guns they don't like. Have any spring problems on your first build??