ar15 won't cycle.

Next time I'm woking on it I'll take some pictures.

As for lube right now I'm using clp break free. Have a bunch from my pistols. Is that okay?
 
Get one of your buddies bcg and see if you have the same problem, eliminate whether its the bcg or the receiver. Check that the bolt is not hanging up in the lugs, bolt could be out of spec. Take the bolt out of the carrier and see if it will slide easily into the barrel extension.
 
You didnt mention the ammo, is it factoty or reloads. If it was reloads you may not have bumped the shoulders back enough which would cause them to not seat and or eject all the way! Just thinking!
 
I like to lube the crap out of a new upper and BCG. Cycle them a ton of times by hand. Then, clean off the grime and reapply a decent amount for the first few mags. That seems to help with any small burrs and such. It will carry them out of the cyclic area and flush em so to speak.

However, I think you're onto something with gas tube alignment. That and a break in and you're good. Provided that everything else is tight and true. A slightly loose gas key reals havoc.
 
I will take the bolt out of the carrier to check that it is not hanging up on the barrel.
Will also try to get my hands on another bcg.

Factory ammo. Hornady 55gr sp

Yep I think the gas tube alignment was off a little due to the hand guard end cap pressing on it slightly. I will double check the gas key.

I'm also going to polish some of the what looks to be over spray from the camo off the inside of the reciever.

Then will lube the crap out of it and work it by hand. Hopefully just needs a little break in
 
Here is a pic when it fails. This is where the bcg would stop when fired and would stop sometimes when manually cycling a round into the chamber.

[img:left] http://s845.photobucket.com/user/4g63t44/media/20150202_225202_1.jpg.html?sort=3&o=0[/img]

so here is where I am at now. I have made sure the gas tube alignment is perfect and have polished the overspreay from the camo mostly out of the upper. The bcg now slides in and out without assitance. Now when manually cycling rounds they all but the first of a full mag will fully seat in the chamber.

I'm going to polish it a tad more then will retest at the range. I will report back after the range test
 
When you are trying to chamber that first round from a full mag, are you pulling the CH and bolt back then letting them return to battery or are you starting with the bolt locked back on the bolt catch?

Also, when you finally get that first round chambered, is it fairly hard to manually eject that round without firing it?
 
Originally Posted By: 4seasons69Originally Posted By: Widow maker 223The bolt should slide easily. Is it the carrier binding or the bolt lugs binding. When you say wont cycle do you mean it isnt ejecting the spent case or short stroking?

When you fire it the bcg only moves back about a quarter inch. And it wouldn't always completely seat the round in the chamber. I would have to use the forward assist

so does it eject the spent case but does not return to battery on the next loaded round or do you have to manually eject the spent case and then strip the next round from the mag?
 
Originally Posted By: pahntr760Run it wet and clean after every mag or two. That will help everything settle in and the parts to wear into each other.

If it starts the cycle that'd the plan!
 
I don't think it's dragging on the mag. if I lock the bolt open with an empty mag and push the bolt release it closes fine.

If i start with the bolt on the bolt catch it will %99 of the time not seat the first round from a full mag. If i pull the handle and let her slam I would say %50 of the time it won't dully seat the first round of a full mag.

Sometimes it's kinda difficult to manually eject the round sometimes it's not bad.
 
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Originally Posted By: midwestpredatorOriginally Posted By: 4seasons69Originally Posted By: Widow maker 223The bolt should slide easily. Is it the carrier binding or the bolt lugs binding. When you say wont cycle do you mean it isnt ejecting the spent case or short stroking?

When you fire it the bcg only moves back about a quarter inch. And it wouldn't always completely seat the round in the chamber. I would have to use the forward assist

so does it eject the spent case but does not return to battery on the next loaded round or do you have to manually eject the spent case and then strip the next round from the mag?

At the range on sunday it would not eject the spent casing and it would not fully seat a round.
 
Im wondering if you don't have a tight chamber. By the pics of your bolt it looks like you have a headspace issue but its weird that the gunsmith ok'd headspace.

Difficult extraction of an unfired round is indicative of headspace. Have you tried multiple typed/brands of ammo?
 
Hmmm I guess anything is possible. I can say that the overspray in the upper was definitely a big part of the issue. the bcg couldn't slide freely through the upper.

I have not tried any different kinds of ammo yet. I can, I do have some.

So now my barrel is chambered in 5.56 aand the ammo I have is .223 would .223 tend to be a little "looser"? The barrel is a Wilson combat stainless steel barrel
 
Overspray no doubt played a role in it but must not be everything or the rifle would be running like a top.

Give it a try with some different ammo and see how that goes. As far as 5.56/.223, I doubt you will find any appreciable difference in case dimensions to cause feeding issues.
 
Okay sounds good. I really need to get to the range to actually shoot it again and see what it does. If after a second range test it still doesn't cycle I will try and find another place to check headspace or maybe buy the gauges my self
 


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