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View Full Version : AR to range...good and bad


gunnery
07-31-2010, 9:04 AM
That range I shoot at is mainly a pistol range. The longest shot is
about 65 yards. Unfortunately all tables were taken so I shot standing
up with the top of a wood barrier as my stabilizer.
The gun was quite accurate (for me)...shooting about a 3 inch group
with iron sights right off the bat. Minor adjustment for windage and heighth.
That's the good news.
The bad news was that it wouldn't cycle. I was shooting .223 Federal 55 grain. After unloading and inspecting, I noticed my mags are actually 5.56
not .223. Could that be the problem? Or something with the gas tube?
Thanks for any info.

sniper4usmc
07-31-2010, 9:07 AM
223 and 5.56 use same mag

Trapper
07-31-2010, 9:12 AM
Did you have a failure to feed or failure to eject? Do you have the correct buffer and spring? Are you using a stock upper or have you made modifications?

ghost
07-31-2010, 9:16 AM
is it short stroking or jamming?

gunnery
07-31-2010, 10:10 AM
After I fire the first shot, nothing ejected. Pull the trigger and
no click. Pull the charging arm back and it ejects the spent brass
and chambers the next load..and over and over.
Buffer and spring are what came with the RR buttsock.
The upper is a DD receiver, bcg, charging arm.
Barrel is a model 1 carbine length.

maddoggie13
07-31-2010, 10:14 AM
Just take an ar postols

CRUCIFIED
07-31-2010, 10:22 AM
i had a similar problem with mine, it turned into a bolt action AR...
likewise i assumed the worst.
turns out i just needed a little lube because it was pretty bone dry.
did you lube it?
a little lube fixed mine right up!
after a few rounds to break it in and rattle things loose it'll run like a champ.

gunnery
07-31-2010, 10:23 AM
What is an ar postols

Fate
07-31-2010, 10:25 AM
I've read reports of some barrels never getting the hole drilled for the gas tube to cycle the bolt. Hopefully you didn't get one. Try the lube option and hopefully that works.

bgoodman
07-31-2010, 10:26 AM
Who is the manufacturer of your barrel? It is possible that the manufacturer failed to drill the gas port hole in the top of the barrel under the gas block.

Fate
07-31-2010, 10:26 AM
What is an ar postols

Hangover posting.

bgoodman
07-31-2010, 10:27 AM
Fate - Lol, we were typing that at the same time. Awesome.

gunnery
07-31-2010, 10:29 AM
I thought I lubed it well, but if that's what it takes I'll make it
really wet.
When I was putting the front sight base, barrel and gas tube together,
it appeared that the hole was drill into the barrel. It went thru into the
barrel from the outside. Is that what you are referring to?
Likewise, there was a hole in the gas tube which matched up
with the hole in the barrel.

maddoggie13
07-31-2010, 10:30 AM
Fat finger on an iphone

Fate
07-31-2010, 10:40 AM
I thought I lubed it well, but if that's what it takes I'll make it
really wet.
When I was putting the front sight base, barrel and gas tube together,
it appeared that the hole was drill into the barrel. It went thru into the
barrel from the outside. Is that what you are referring to?
Likewise, there was a hole in the gas tube which matched up
with the hole in the barrel.

Gas tube installed upside down? Oh wait,you said you matched the holes. (Any sign/residue of gas escaping out from under gas block due to misalignment of holes?) Is your bolt carrier key tight and staked well? Bolt gas rings staggered? Weird, weird, weird.

gunnery
07-31-2010, 10:47 AM
Bolt gas rings staggered...I don't understand.
How do I check that.

vta
07-31-2010, 11:06 AM
do a complete strip of the BCG and inspect that if nothing else seems out of place. why dont you post some pics. it will let us help you identify the problem.

Mac Attack
07-31-2010, 11:21 AM
Question do you shoot your rifle with a .22 conversion unit? The reason I ask, is because I had the same issue a long time ago. At the time I was limited to pistol ranges so I used my conversion unit quite a bit. When I went to shoot 5.56 I had FTE. Turns out the lead 22 bullets shavings blocked the gas port on my barrel. I had to take off my FSB and hand drill out all the lead the port. This fixed it. Now when I shoot 22's in my AR I make sure to shoot a round or two of 5.56 to make sure my port does not get blocked again.

SDRuger
07-31-2010, 12:04 PM
Has to be a gas system problem

shooting4life
07-31-2010, 12:52 PM
If you have an adjustable gas block make sure it is open. Are you getting carbon build up on the carrier key?

gunnery
07-31-2010, 1:25 PM
http://i931.photobucket.com/albums/ad154/menihune/ar15boltbcg002.jpg
http://i931.photobucket.com/albums/ad154/menihune/ar15boltbcg003.jpg
http://i931.photobucket.com/albums/ad154/menihune/ar15boltbcg001.jpg
Enclosed are pics of the stripped bcg.
Bolt gas rings are staggered and nothing else looks too out of wack.
I was thinking of running some pressurized air from the receiver end of the
gas tube and trying to detect if it was making it thru to the barrel.
Maybe put a dummy round in the breech and put a kleenex over the
muzzle to see if it moves. Does that sound reasonable (before disassembling
the whole thing)?