I just picked up my AR-556 MPR in 450 Bushmaster from my FFL yesterday. I took it apart to clean and lube it today. I got to removing the bolt carrier group and the firing pin retaining pin, no problems. I pushed in the bolt so that I could rotate and remove the cam pin, but the bolt felt like it dragged and then was stuck at the rear. The cam pin would not rotate. I soaked it in Rem-oil and then it took about 20 minutes of prying it in and out before I was able to rotate and remove it. I then cleaned and lubed all the parts back up and began to put it back together. When inserting the bolt, it is super tight, to the point where it almost won't move in and out. When I get it in the correct position, the cam pin will not fit. If I pull the bolt out, the cam pin fits properly.
Had to contact Ruger and ship the brand new rifle to be looked at.
Had to contact Ruger and ship the brand new rifle to be looked at.
