What's Wrong With My Rifle?

[MilesTeg]

Sorry I'm a little late to the party. It sounds like you found your issue. One thing I don't think was mentioned is the alignment of the gas tube. If your BCG doesn't align well with the tube it can cause malfunctions that mimic a gas problem. Well in all fairness it kind of is a gas problem.

I would go back out and shoot the thing and hopefully it won't happen again. Sometimes weird flukes happen.

 

[Eddie Gunks]

You do not have to dimple the barrel.

If not done 100% correct it could leave you with a misaligned gas block.

Keep us posted.

 

[meketrefe]

I really don't know what caused it to come loose. I put dimples on the barrel per the instructions and everything. Perhaps they weren't dimpled deep enough? The screws weren't put in correctly or all the way? I'm kind of at a loss.

The entire group goes through a pretty violent activity between heat and vibration.
That is why I suggest steel clamp and have them either stacked or with pressure washers + blue locktite.
The set screw are many times problematic because they might not provide the same level of seal but you should be
able to resolve it with some blue locktite at the mouth of the gas tube connection, some around the gas
port and specially the set screws. Also if the screws do not seem up to the task for extra torque you will
find them in any ACE hardware store of good quality including stainless steel.
Gauge the gas port with a bit until you find the right size.
Still check the gas rings and other items in the list. Will not hurt to reduce tension and or friction as it applies.
It is nor rocket science, it just requires to follow the steps and close observation since it is hard to diagnose
everything via forum. A lot of it goes by look and feel and testing.
You are doing the right things so far though.

 

[DoD1776]

"What's wrong with my scope" -Dayten

 

[Acer-m14]

 

[Acer-m14]

also make sure no leaks on the bolt gas key too

 

[Catskillkid]

You see, I watched that very video and followed it to a T (or so I believed). I probably won't have a chance to fire it tonight. More likely tomorrow. Hopefully it was just not put on tight enough.

 

[Snappo]

So I recently completed a new AR build and finally had a chance to take it out yesterday. I'm less than enthused.

Began shooting (5.56 NATO 55 grains) and while it seemed to cycle ok the rounds were not exactly ejecting. Basically just plopping out of the port and falling on my shooting bench. After about 10 or so rounds it got worse to the point where it will jam after firing off only one round.

I took it apart, looked at the bolt carrier group (Anderson Manufacturing. Have one in another build that works flawlessly) and seemed ok. Barely fired but stripped, cleaned and lubed it. Tried a different magazine. Still the same issue.

Any ideas?

You have a gas pressure problem (you are under-gassed). You probably just need an adjustable gas block so you can get it tuned perfectly. I swear by John Paul at JP Enterprises for my AR15 and bolt action parts like gas blocks, recoil eliminators, etc. JP Rifles

I also recommend you call him and ask about the strength of your buffer spring - maybe you have too much spring pressure?

 

[prambo]

To me it looks like gas leakage due to loose or poorly fitting gas block.

Go with @meketrefe on this, he's got his shit wired tight on this stuff.

 

[ManrisFrack]

To me it looks like gas leakage due to loose or poorly fitting gas block.

Go with @meketrefe on this, he's got his shit wired tight on this stuff.

I agree. That first pic looks like gas is leaking out everywhere on that block.

 

[Catskillkid]

So I re-positioned the gas block, drilled the dimples a little deeper, tightened it down good and snug and reassembled everything. Just got back from the range to just test fire it some. Shoots like a dream with no issues from the twenty or so rounds that I fired through it (relatively rapidly too). Extraction was fine. Cycling was fine. Loading was fine. When I have some more free time (not until next week unfortunately) I'll take it out and do a proper sight-in.

Thank you all for your advice and help with the situation. This is one of the many reasons why I love this forum. Good, knowledgeable people who are always willing to help out.

 

[Robin]

Awesome!!!! Good job!!
Robin