I took the rifle to the range for the first time today (finally). It will not fire semi-auto. The first shot fires, but it will not strip the next round from the magazine and load it into the chamber. I'm wondering if I need a carbine buffer instead of the rifle buffer that's in it. Anybody? Other than that, it shoots well. The YHM compensator makes one heckofa racket and shock wave. Hope I can figure this out.

The longer Ace stock (the one you have) uses a rifle buffer - so that's fine.

 

What ammo were you trying to shoot through it?

Would the round extract & eject when you racked the charging handle?

Was the rim of the casings stripped/scratched where the extractor was grabbing on o the lip?

After the first shot, the trigger would go "click" so Apparently the trigger was resetting. I had to work the charging handle to eject the spent round and load the next round. Then it would fire. I was shooting Federal and PMC brass, not the usual cheap steel case stuff that I use. I didn't notice if the spent brass was scratched or not.

After the first shot, the trigger would go "click" so Apparently the trigger was resetting. I had to work the charging handle to eject the spent round and load the next round. Then it would fire. I was shooting Federal and PMC brass, not the usual cheap steel case stuff that I use. I didn't notice if the spent brass was scratched or not.

 

did the bolt move at all..

like shoot.. bolt move.. no ejection

or did the bolt not move at all?

 

when you hand cycled the weapon it shot fine?

The bolt moved enough to reset the trigger, but the spent round was not ejected, nor was the next round loaded. I had to operate the rifle like a bolt gun to shoot it.

when you hand cycle gun.. do you feel anything binding up.. dragging.. my knowledge of ARs is minimal.. but if the bolt is not cycling only two things really come to mind..

 

it is not getting enough gas to cycle

the bolt is hanging up on something

 

the bolt is hanging up on something

 

Maybe I put too much grease in the buffer tube? Took the bolt out of the upper and the back inch and a half to two inches of the BCG was covered in grease from the buffer tube. Maybe that's slowing the bolt down too much?

How much force do you have to use to charge the gun? Does it feel like it's getting hung up on anything? Are there any weird wear marks on the BCG, inside the upper, or on the buffer tube?

 

I'd try giving it a good cleaning and try again. Lay off the grease. I don't use any grease. All I've ever done is clean and lubricate with CLP. Het a nice shiny coating on everything. For the buffer and spring I just wet a cloth in clp and rub the spring with the cloth.

 

I'm not an expert but if none of this works it could be something with the gas system. sounds to me like if none of the above is the problem it would have to be undergassed. From your description the BCG is coming back enough to reset the trigger but not enough to eject the round. Kind of like when you practice with snap caps...you don't have to completely penis the gun to reset the trigger. A problem with the gas system could do this. What kind of AR is it?

 

...you don't have to completely penis the gun to reset the trigger.

 

???

???

 

This forum changes the work c*ck to penis for some reason. Scratch the question about the AR i just reread the thread and realized what you have

I'm laughing my @ss off right now haha

Working the charging handle is nice and smooth, I hope that the grease in the buffer tube is the problem. The book I have suggested some grease (IIRC) in the tube to quiet the "Boing". I may have gone overboard.

This forum changes the work c*ck to penis for some reason. Scratch the question about the AR i just reread the thread and realized what you have

Censorship sucks...

If that's not the problem the only thing I can think of is the gas system...I'm assuming you've checked it out but is the gas tube long enough? do the gas tube and gas key line up and slide into each other?

I doubt it is a Grease issue..if you had too much grease in it, it would be pouring out the vent hole in the stock bolt....if you don't have a grease stain on your shirt, then that isnt it. What it sounds like to me, without having the rifle in hand is a Gas problem. Take your handguards off, and inspect your gas tube, make sure it isnt kinked. Inspect the gas block and make sure it is up against the shoulder of the barrel, also take a look at it, and see if it appears square, if it's kinked a little to one side or another it'll block the gas port a little bit. Without having the rifle in front of me I can't really troubleshoot further than that.

I'm with Pipes on this, sounds like the gas block isnt indexed correctly. Are there dimples in the barrel for the gas block?

"grease"?

 

I doubt seriously it is "grease" but I have seen an AR not cycle from being dirty.. dirt and grease are not the same thing.. but if it is thick nasty heavy grease? maybe it is causing it to stick? but as I was saying before I think it is getting hung up OR a gas issue..

 

did the gun cycle even a single time? or nothing at all?

Censorship sucks...

 

The filter is designed to keep the forum from being tagged as porn by web filters, which would block the site for many who browse it while at work.

I think the free floating gas block may be the culprit.

 

 

That looks like a solid possibility!

"grease"?

 

I doubt seriously it is "grease" but I have seen an AR not cycle from being dirty.. dirt and grease are not the same thing.. but if it is thick nasty heavy grease? maybe it is causing it to stick? but as I was saying before I think it is getting hung up OR a gas issue..

 

did the gun cycle even a single time? or nothing at all?

I saw one once that had the buffer tube FILLED with Grease..on the advice of an online "Expert" It was an A2 stock so, as the shooter fired, the buffer came back and acted like a piston, squirting the grease out of the drain hole all over the shooter.

That would qualify as a "Whoopsie" Robert....

That would qualify as a "Whoopsie" Robert....

 

I only put the lower together...

Wow. Who built that upper?

Is this thing running yet? start with the simplest first, right? Were the the bolt & bcg lubed at assembly? Also look for wear marks where the buffer enters the buffer tube. I had moved a bunch of parts around on a build and mixed a buffer and buffer tube trying to figure out what set up I was going to use. That gave me a single shot. Good luck

Is this thing running yet? start with the simplest first, right? Were the the bolt & bcg lubed at assembly? Also look for wear marks where the buffer enters the buffer tube. I had moved a bunch of parts around on a build and mixed a buffer and buffer tube trying to figure out what set up I was going to use. That gave me a single shot. Good luck

 

Look at the pictures a few posts higher...

Just an FYI for you builders out there....BEFORE You go spending money on a specialized tool for setting the front takedown pin, Go to Lowes or Home Depot, and spend $0.79 on a 1/4" clevis pin. This will do the EXACT same thing as the $10+ tool from Brownells....too bad i found out about this AFTER i already bought the commercial one.

 

You can also use a 1/4" roll pin punch. The clevis pin may slightly work better, but if you already have the punch set, it gets the job done just as easily without making a trip out to Lowes or HD. Insert into opposite end of lower until it fills both ears, depress the takedown spring and pin detent with finger, and push the punch the rest of the way through. Then push the punch back out with the takedown pin. Worked like a charm.

maaaaa...... Oh Balls!!! set screws?

Yeah the gas block is designed to sit right up against the barrel lip. So having the hand guard mount is going to push the gas block port forward. If you want to keep the current configuration, u can either make the hole in the gas block oversized, or grind down some of the material off the end of it to make it line up with the barrel hole.

 

One issue remains, how the hell do u get it off now? I would get in touch with who ever assembled your upper.

I only put the lower together...

 

i meant on the Seller's part, not yours...Looks like someone didnt torque down the set screws enough if at all.