Wash It passed the blow test and gas tube appears to be aligned perfectly (blind in one eye, can't see out of the other...). I am going to purchase another tube, buffer and use the same spring (I got extras). I will do all this in the coming weeks and will update all. Thx ALL for help Shibiwan After I install all the parts listed above, I will continue to watch the retaining snertzle and BCG rear end for wear. Are you saying the BC is too long or my receivers are not compatible? No matter, the beat goes on. Keep your powder dry, hussein continues to want our weapons. jd