I thought it would be interesting to post some observations from things I have seen over the years, and specifically in regards to things I have seen over the last few months teaching my AR15 Armorer Course.
Problem- Bolt Carrier Group wouldn't move freely inside the upper receiver. The person in question had a 20" upper assembled by someone "knowledgeable" in AR's. turns out the gas tube was tweaked and the carrier key was hitting the gas tube. Because this person was inexperienced he just kept forcing the carrier into the upper.
Solution- Using a flat tip screwdriver we placed it into the upper between the receiver wall and the tube and then did a slight tweaking. The tube straightened and the carrier moved freely afterwards.
If you are going to build or have someone build you an AR make sure that you understand the parts and tools required to complete the task. If someone else is building it make every effort to determine what their competency and skill level is beforehand and thoroughly check the weapon. If necessary have them walk you through what they did or provide a spec sheet of the details.


Reply With Quote

Bookmarks