an ez to print and ez to build ar15 bolt designed to shoot 22lr, tested and working but currently trying to get ejections more consistent. <br />README IS MISSING INFO-if no buffer tube will be used print upper with threads up, picatinny towards you and located at 0,0,0. add support blocker location should be -1,30,76 and scaling should be 6mmx20mmx65mm. with the support blocker highlighted click "per model settings"->"modify settings for overlaps"->"cutting mesh"->"select settings"->check box for wall line count, top layers, bottom layers, and infill density->click close-> now change all those support blocker settings to 0