• The Shot You’ll Never Forget Giveaway - Enter To Win A Barrel From Rifle Barrel Blanks!

    Tell us about the best or most memorable shot you’ve ever taken. Contest ends June 13th and remember: subscribe for a better chance of winning!

    Join contest Subscribe

Nickle boron bcg not going into battery

SamBlankenship

SamBlankenship

Sergeant of the Hide
Full Member
Minuteman
Oct 4, 2018
201
69
Princeton West Virginia
#1
Need to pick some brains if yall dont mind. I picked up a nickle boron BCG for my AR10 and with ammo it will not go into battery. Without ammo it goes into battery perfect. Using factory ammo. My question is. It is a buffer spring issue? Headspace issue? Possibly a buffertube issue? The buffer tube, buffer, spring and BCG are all new.
 
#3
I have one in my AR10 .308, and it definitely feels like it lags sometimes. I'm wondering if my problem is too tough of an ejector spring. If that's even a thing.....
 
  • Like
Reactions: SamBlankenship
#4
Wulf said:
I know it’s not the easiest thing to do. But have you tried takeing the bolt out of the bcg putting a round into the chamber and seeing if the bolt will lock up on the chamber?
Click to expand...
I havent tried that. i do know if you drop the bolt about 3 times it will engage into battery but just far enough out the firing pin will not strike the primer. Im thinking headspace issue but. When i switch it out with the old BCG it does the same thing but drop it again and it goes into battery and will fire. Thats why i was thinking the spring is too weak possibly.
 
  • Like
Reactions: Wulf
#6
I'm not even sure it relates to your problem; but its Nickel Boron, and I had a few rounds that seem to need an extra "bump" to go fully into battery. Same rounds showed a couple swipes/scratches on the case neck.
 
#8
Both Federal factory, and FL sized reloads. Not all, just a few. No, I did not measure them. Forward assist, or extract, put back in mag, slingshot the charging handle, back on the trigger
 
#9
SamBlankenship said:
I havent tried that. i do know if you drop the bolt about 3 times it will engage into battery but just far enough out the firing pin will not strike the primer. Im thinking headspace issue but. When i switch it out with the old BCG it does the same thing but drop it again and it goes into battery and will fire. Thats why i was thinking the spring is too weak possibly.
Click to expand...
Do you have a foreword assait on the rifle? Also have you check the chamber for and debris in it? Seems strange the original bolt is having a similar issue. Personally I’ve never had a buffer spring be too slack to push a bolt home. Do you have an ar10 specific buffer spring in your rifle? If it’s dpms pattern it should be around 12.75” long
 
#10
I took the A2 stock off and put a aftermarket 6 position on it switched the ar15 buffer and spring with a 308 buffer and buffer spring. And yes ive check the chamber its clean and clear best i can tell i ran a chamber brush in it a few 20-30 times and didnt get anything out of it the original bcg with the A2 stock worked flawless. These issues started after i switched the stock and tried the new BCG.
 
#11
If you are using the buffer from the a2 stock I’m gonna give my best guys without rifle in hands you are on the right road thinking you have a buffer issue. ( Assuming you are using a rifle length ar10 buffer vs the carbine length buffer the difference in length might be keeping you out of battery )
 
#12
Wulf said:
If you are using the buffer from the a2 stock I’m gonna give my best guys without rifle in hands you are on the right road thinking you have a buffer issue. ( Assuming you are using a rifle length ar10 buffer vs the carbine length buffer the difference in length might be keeping you out of battery )
Click to expand...
Im using a carbine buffer and spring for 308.
 
#17
I wouldn't think it would be anything with the buffer it's self. I just had a problem with my lr 308 I had bought where the person before put an a2 stock on and kept the carbine 6 position stock spring and buffer. The buffer just stops the bolt from bottoming out against the frame. Yes the buffer can be tuned to help with other issues but I would think it's more with the new spring or tube itself. There may be a bur on the inside of the tube slowing the bolt down. A heavier spring may fix the issue or let it work because of the extra force pushing the bold forward. Look your tube over well. The old bolt has a little wear so that may be why it works slightly better. My bolt had beat the frame and the end of the tube up enough the spring was dragging over the edge and making noise and that's what informed me that there was an issue with it. Check out the little spring loaded pin that keeps the buffer in the buffer tube and see if it's catching something.
 
#18
Yellowfever440 said:
I wouldn't think it would be anything with the buffer it's self. I just had a problem with my lr 308 I had bought where the person before put an a2 stock on and kept the carbine 6 position stock spring and buffer. The buffer just stops the bolt from bottoming out against the frame. Yes the buffer can be tuned to help with other issues but I would think it's more with the new spring or tube itself. There may be a bur on the inside of the tube slowing the bolt down. A heavier spring may fix the issue or let it work because of the extra force pushing the bold forward. Look your tube over well. The old bolt has a little wear so that may be why it works slightly better. My bolt had beat the frame and the end of the tube up enough the spring was dragging over the edge and making noise and that's what informed me that there was an issue with it. Check out the little spring loaded pin that keeps the buffer in the buffer tube and see if it's catching something.
Click to expand...
I had initially though about the detent dragging the BCG and that is a possibility. Ill swap it out or file it down slightly. But it didn't show any wear from the BCG dragging on it put i can't rule it out. And yeah your right the buffer wouldn't have anything to do with it. Ill swap tubes and springs in the morning and see what happens. I have a few other stocks i can switch it with off of other guns. I was hoping to avoid taking one that works apart to fix one that doesn't haha.
 
#19
The buffer is a tuned mass damper, it does a lot more than keep the bolt from bottoming out. It's main job is to prevent BCG bounce in full auto applications.

It sounds like you have an AR15 size carbine buffer tube and a shorty buffer.

My preferred setup is an AR10/Vltor A5 length buffer tube and an AR15 length buffer. That way you can tune it with standard and heavy AR15 buffers instead of expensive shorties. Which ever way you go you need a matching spring.

But the buffer and tube should not cause any problem unless it's grossly wrong.

The more likely cause is the headspace in the bolt.

So what barrel and bolt did you have before and after?
 
#20
Its a DPMS barrel factory LR308 gun. I swapped out the a2 stock for a collapsible stock with a buffer tube from a ar15 kit i purchased. Then i swapped the spring and buffer for a 308 short buffer and spring like you mentioned. The factory bcg was switched out with the NB all at the same time as the stock. And even the factory bcg is acting up also now.
 
#21
My first thing to do is just cycle a lot of dummy rounds.

You can also try mixing your old bolt with your new carrier and your new bolt with your old carrier. That might let you track it to more bolt or more carrier.

If you have a set of calipers and know how to use it you can measure the headspace of the two bolts from the back of the bolt lugs to the bolt face.

I take it your old bolt is a DPMS and I don't know what your new one is.
 
#24
no one will confuse me with a gunsmith, but if it works fine without ammo, with new and old bcg's, sounds like ammo or chamber problems. when you pound the rounds in there, do they come out easily? can you just drop a round in and will it seat?
 
#25
When it goes into battery finally yes the round will eject freely it doesnt sound or feel like the brass is sticking or dragging. At all. I can drop a round in the chamber and drop the Bcg and it will not go into battery. Takes 3 tries to get it to engage and go into battery. Pull the charging handle again round is extracted no problems and loose just fine no scrapes or gouges
 
#26
davsco said:
no one will confuse me with a gunsmith, but if it works fine without ammo, with new and old bcg's, sounds like ammo or chamber problems. when you pound the rounds in there, do they come out easily? can you just drop a round in and will it seat?
Click to expand...
It almost acts like the bcg is dragging on something or not being sent hard enough by the spring. I switched out buffer tubes and springs last night and im going to see how she runs today.
 
#27
If it hadn’t been for the original bolt being sluggish also I would say the coating may have been just enough to make the bolt bind. I’m really on the side of it being a buffer assembly issue. To short of a spring not heavy enough buffer lots of possibilities in that region by it self
 
  • Like
Reactions: SamBlankenship
#28
I didn't believe the buffer had anything to do with feeding the round while using the charge handle. The buffer comes into effect when firing the rifle, when you are talking about chambering a round with the charge handle and having to cycle the charge handle 2 or 3 times to seat a round i am assuming that means you aren't firing a round, what about the magazine your using is it different then what you were using before?
 
#30
I did not try the factory bolt again after i got the new one cycling. Ill have to try it tomorrow and see if the bore brush helped it maybe she had something in the chamber that was letting the round stick. There was no marks on the case to give me that impression but its possible.
 
#32
SamBlankenship said:
Well found out today that its a Aero bolt not a dpms. And it had two o-rings on the bolt and removed one and it cycled just fine. Also cleaned the chamber with a chamber brush as that might have been a slight issue but she runs like a dream now. I appreciate all the input from everyone
Click to expand...

The double O-ring on the extractor. I've ran into that. What a pain.
 
  • Like
Reactions: SamBlankenship
#35
I've never owned an Aero BCG. I like their receivers a lot. I would have tried one of their BCGs except they were always more expensive than a Toolcraft. Now I'll actively avoid them, even if the price becomes comparable.
 
  • Like
Reactions: SamBlankenship
You must log in or register to reply here.

Similar threads

1222travis
AR10 6.5 Creedmoor problems.... Need Help Bad
Replies
14
Views
1K
UncleDano
U
WeR0206
Heads up, make sure to have a spare gas key, screws, and sealant on hand if getting short stroking etc.
Replies
20
Views
680
TonyAngel
T
P
SOLD Rubber city AR15 BCG titanium LW adjustable
Replies
1
Views
191
Will J
Will J
J
Criterion barrel brass pressure signs
Replies
50
Views
2K
tucaz
tucaz
I
AR10 possible headspace problems
Replies
13
Views
847
bfoosh006
bfoosh006
Top Bottom
Back
Home
Forums
Merch
Alerts