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Page AR-15 » AR Discussions
AR Sponsor: bravocompany
Posted: 1/27/2009 10:43:14 AM EDT
I went to go site in my rifle and after the first shot my bolt was not coming back by its self. It didnt even move. What is causing this? I have a semi automatic Ar-15 carbine.
Link Posted: 1/27/2009 10:45:06 AM EDT
did you build it or buy it complete?

the bolt carrier needs gas to operate so if you built the upper the gas block and gas holes in the barrel might not be aligned

Need more info
Link Posted: 1/27/2009 10:45:45 AM EDT
Are you saying it didn't come back and eject the cartridge or it ejected and didn't chamber a new round and the bolt stayed open.
Link Posted: 1/27/2009 10:46:35 AM EDT
I recently put a flat top upper on it. When I put back together my gas tube it was bent a little but I just bent it to where it fit and didnt catch on anything.
Link Posted: 1/27/2009 10:47:16 AM EDT
It didnt even try to eject. It just held the spent round in the chamber
Link Posted: 1/27/2009 10:47:39 AM EDT
Check the gas system.  The key on the bolt carrier, gas tube and then the gas block and barrel.
Link Posted: 1/27/2009 10:48:02 AM EDT
Gas tube is upside down?
Link Posted: 1/27/2009 10:49:28 AM EDT
So long as you can manually cycle the weapon then no gas is getting to the carrier then:

Check to see if you have an adjustable gas tube, it may be shut off.

Check if the front sight/gas block is canted.

Check to see if the carrier key is loose or improperly staked.

Check to see if the cam bolt is obstructing the movement of the bolt in the carrier.
Link Posted: 1/27/2009 10:49:36 AM EDT
It cant go on upside down? Which is the right way? Is it the hole needs to be up or down?
Link Posted: 1/27/2009 10:52:07 AM EDT
Gas tube is upside down?

I've done that once.  
Link Posted: 1/27/2009 10:52:37 AM EDT
It cant go on upside down? Which is the right way? Is it the hole needs to be up or down?

Hole needs to be down

Are there any crimps in the gas tube? Bends are ok, crimps will effect gas flow
Link Posted: 1/27/2009 10:53:59 AM EDT
It cant go on upside down? Which is the right way? Is it the hole needs to be up or down?

down lining up w/the hole in the barrel
Link Posted: 1/27/2009 10:54:17 AM EDT
Ok, I will check the tube to see which way the hole is pointing. I think I might have done it wrong. Im new installing hardware on my rifle.
Link Posted: 1/27/2009 11:36:03 AM EDT
Link Posted: 1/27/2009 1:08:48 PM EDT
Yep, thats exactly what it was. It fires just fine now. Thank you all for the advice and tips.
Link Posted: 1/27/2009 1:54:17 PM EDT
You do not have to be a senior to have a senior moment.

I am glad you got it going.
Link Posted: 1/27/2009 2:28:28 PM EDT
+1 for ARFCOM's helpfulness!  ya'll are good people... most of the time =)

Glad you could get your rig up and going!
Page AR-15 » AR Discussions
AR Sponsor: bravocompany
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