AR15 Help

[IonicDOG]

Hey guys, I need some help to diagnose the problems I'm having with my AR pistol I buillt. I'm at my whits end with this thing.

Here's the specs on the build

Upper:
JSE surplus 11.5" CMV barreled complete upper
Semi-Auto BCG and charging handle that came with upper

Lower:
Spikes lower receiver
RRA LPK
ACE improved pistol receiver extension buffer tube


I'm getting constant double feeds, failure to ejects, and spent casings jammed between the bolt face and the charging handle.
If I load 1 round into the mag and shoot it, it won't lock the bolt back. I used 6 different Pmags all with the same result.
I took the bolt carrier out of my bushmaster, which is identical, and used it and the gun ran perfectly.
I thought the buffer not being heavy enough might be the problem until I put Bushy BCG in it and it ran fine. The buffer in the pistol and the rifle seem to be the same, no markings on either one.
I'm using Federal 55gr 5.56 ammo

I called JSE and they told me that the upper needs to be broken in, but the problems have not gotten any better the more I try to shoot it.
Here are some pics of the jams:

This one was a real doozy, spent casing was stuck between the top of the bolt and the charging handle, in the channel of the charging handle

All these jams are separate incidents.

Anybody got any advice on how to remedy these problems?

Thanks,
Josh

 

[Crimson]

It looks like you have way too much oil on the bcg to start.

You've eliminated the mag problem, so it's got to be feed ramp/BCG issue. Clean it and lightly oil the bolt and go from there.


Also be sure the feedramps are aligned and cut correctly.


If you have another bcg try it.

 

[Vanilla Gorilla]

It looks like you have way too much oil on the bcg to start.

You've eliminated the mag problem, so it's got to be feed ramp/BCG issue. Clean it and lightly oil the bolt and go from there.


Also be sure the feedramps are aligned and cut correctly.


If you have another bcg try it.

You CANNOT over oil an AR. That's terrible advice. The feed raamps are also no capable of causing double feeds. The problem is that JSE sells parts that are so shitty and out of spec that they should be ashamed of them. No AR Upper requires a break in. That's a manufacturer trying to find an excuse for some junk they sold not working as it should. Insist that they replace both the upper and BCG although I'm fairly certain a junk Bolt and Carrier Group are the problem. Again you CANNOT over lubricate an AR.

 

[Tulse Luper]

Ah, the break-in brush-off.

 

[IonicDOG]

You CANNOT over oil an AR. That's terrible advice. The feed raamps are also no capable of causing double feeds. The problem is that JSE sells parts that are so shitty and out of spec that they should be ashamed of them. No AR Upper requires a break in. That's a manufacturer trying to find an excuse for some junk they sold not working as it should. Insist that they replace both the upper and BCG although I'm fairly certain a junk Bolt and Carrier Group are the problem. Again you CANNOT over lubricate an AR.

That's what I was thinking, I never heard of an over oiled AR. I have tried another BCG and it worked fine. I'll be calling them monday to try to get the issue resolved.

 

[Rabbit]

My bet is on the extractor spring.

IF IT WERE MINE..... I would take the spring out of another BCG and swap just the spring and see if that helped.

 

[Crimson]

I don't know I guess it's just me, the oil makes it dirtier faster, although I do agree more oil may make it run longer dirtier but I hate cleaning them everything gets nasty the oil makes it worse. I lightly oil and never have any problems, clean up is faster, but I only shoot 2-300 rounds at a time....

 

[swamper]

I don't mind the cleaning. It's that time when it could have used more oil and there ain't exactly time to do it.

For plinking or range, I could understand though.

 

[Guate_shooter]

got damm dude it looks like you have motor oil in that thing .............

 

[goteron]

Try putting in a Black D-ring and + Extractor Spring. Your bolt speed may also be too fast (Gas port too large?)

 

[IonicDOG]

Thanks all, gonna swap out springs tomorrow and see if that helps.

Sent from my ADR6400L using Tapatalk

 

[goteron]

Is it a new recoil spring? What buffer are you using.

 

[IonicDOG]

Is it a new recoil spring? What buffer are you using.

New carbine spring and carbine buffer, and that's what has me baffled, I took the bcg out of my 16" bushmaster and put it in the new upper and it ran perfectly, no jams, and it locked the bolt back on empty mag. Both bcg's are s/a and look the same.

Sent from my ADR6400L using Tapatalk

 

[goteron]

Try just changing the bolt. My guess is it's a weak or defective extractor.

I would switch to an H buffer as well to slow things down a little.

I bet a new extractor with a strong extractor spring and d buffer will fix all of the issues.

 

[missingAZ]

You need a much heavier buffer, at least a H2. I like the Spikes T2, my brother uses the T2 in a 8.5 in LWRC SBR and it works well. If you go SBR get the VLTOR A5.

 

[Rabbit]

You need a much heavier buffer, at least a H2. I like the Spikes T2, my brother uses the T2 in a 8.5 in LWRC SBR and it works well. If you go SBR get the VLTOR A5.

If it works with his other BCG why would he need need to change buffer?

 

[IonicDOG]

If it works with his other BCG why would he need need to change buffer?

I was just about to ask that question.

HTC Thunderbolt

 

[slowhandlukem]

Now that's funny.There is enough oil in that thing to run my car.As far as over oiling.
Sure its possible and can happen.If you will look,you will see there is so much oil,it
is getting on the shells.Which in turn is making them sticky.You can tell this because
there is oil on the shell deflector.That could cause FTE issues,but unlikely.I agree with
the BCG change.Most company's do not make their own BCGs.SO it happens.But sure
JSE sucks,,I say everyone quit buying from them.Boycott.LMAO

 

[Vanilla Gorilla]

Now that's funny.There is enough oil in that thing to run my car.As far as over oiling.
Sure its possible and can happen.If you will look,you will see there is so much oil,it
is getting on the shells.Which in turn is making them heavier.You can tell this because
there is oil on the shell deflector.That could cause FTE issues,but unlikely.I agree with
the BCG change.Most company's do not make their own BCGs.SO it happens.But sure
JSE sucks,,I say everyone quit buying from them.Boycott.LMAOOOoooo

And your supposing the drops of oil making the "shells" heavier is causing them to not extract? You clearly have not seen the violence of action and forc involved in an AR cycling. You cannot over oil an AR. Whatever excess oil you apply will be flung out the open ejection port as the bolt cycles. Its almost as if an engineer designed it to be so....oh wait.

 

[goteron]

It's not the BCG! Or the oil!

I 100% bet it's the extractor failing to pull the case out of the chamber. What do your case rims look like?

There could be several underlying issues.

Carrier velocity too high (gas port too large), too much pressure at extraction and carrier speed too high to hold Onto case
Chamber out of spec (too much friction)
Weak extractor spring
Out of spec extractor

A slow bolt velocity and delayed unlocking is always preferred. A heavier buffer helps with this. Stronger extractor springs will help to hold onto the case rim.

I would use the heaviest buffer that gives 100% reliability with the weakest ammo you will use.