I assembled my first AR-15 lower several months ago. It has cycled and fired probably less than 500 rounds with no misfires or failure to feed issues. However, the bolt catch does not hold the bolt open very well without an empty magazine inserted. In other words, it holds perfect with an empty magazine inserted. I can bump the firearm from any angle and the bolt catch holds the bolt back out of battery with empty magazine inserted…
It takes very little jarring of the firearm to release the bolt into battery once the magazine is removed. Since I bought an “oops” kit, I have 2 trigger disconnect springs, 3 bolt catch springs, and 2 bolt catch plungers. Either the lower kit or the oops kit must have thrown in an extra bolt catch spring. I have compared the 3 springs and the 2 plungers and see no visible discrepancies. I have blown the hole out (in the receiver) to be sure there is no debris. I have tried multiple combinations of the springs and plungers and the results are always the same; I even tried the spare trigger disconnect spring for comparison, and still same results.
Based on this, I am considering cutting one coil out of one of the bolt catch springs, test, and cut another coil and test until it “seems” right.
Any other ideas or has anyone else had this problem?