Took my newly assembled AR to the range today with my 10 year old son, along with a few other toys. and after about 20 rounds I had a FTF. I pulled the round out of the chamber and it looked line the firing pin didn't strike the primer. I noticed the denting and scraping on the case, and set it aside. On one of the mag's I unchambered a round and it had the same marks on it. After collecting the brass, I noticed that they all had the scrapes on them. I'm guessing the dents got hammered out during the ignition. All of the rounds chambered just fine, they all ejected nicely too with little force.
I'm relatively new to AR's, but I suspect that I need to do some polishing of the lugs on the barrel extension? or maybe knock off some sharp edges?
This is a PSA assembled upper chambered in 5.56, 1:7 chrome lined.
Thanks for any help!
Steve
I'm relatively new to AR's, but I suspect that I need to do some polishing of the lugs on the barrel extension? or maybe knock off some sharp edges?
This is a PSA assembled upper chambered in 5.56, 1:7 chrome lined.
Thanks for any help!
Steve