Advice Please?????? - The Firearms Forum

ka64 · 07-30-2012, 09:51 AM

Take the new AR out for some fun, it was not fun!!!!!!!!!!!!!!!!!

First 10 rounds flawless, after that bolt would jam 3/4's closed. Did this several times before I said Fudge it. Problem is I put a new Nickel Boron Carrier in it. After a process or elimination I believe its a headspace issue.

Brand new Colt 6720, FailZero Nickel Boron Carrier.

Bolt cycles fine racking in & out ammo without pulling the trigger.

Colt is 556, ammo is PMC 223 & 556.

Bolt fires one round, ejects the case & jams 3/4's closed on inserting the next round.

No visible wear or stress on the spent round.

Any Ideas?????????????????

hunter29180 · 07-30-2012, 11:06 AM

have you changed mags? is the feed ramp smooth and shinny..(in other words has it been polished to reduce drag and to align it to the bore)..others will be along shortly who know a whole lot more than me!

Snakedriver · 07-30-2012, 11:20 AM

Most feeding problems in an AR come from a faulty magazine. Try a different one and see what happens.

Then if the feeding issues continue, take a look at your feed ramps into the chamber to make sure there are no burrs.

Also, if you are using cheap commie steel cased ammo, throw all of it in the trash and try some real brass cased ammo. The cheap stuff will gum up your machine on the chop-chop!

ETA: I see you're using PMC Ammo, so that's good. It could be a break-in issue. Did you clean the gun good after you got it and lube everything well prior to you range trip?

time2shoot · 07-30-2012, 11:36 AM

Don't think its you carrier.
I have found out that some AR's are very touchy about the rounds you shoot through them.
I would start by trying .556 ammo.
.223 and .556x45 difer mainly in the presher they creat. Which is the main couse of most AR feeding ishues.

ka64 · 07-30-2012, 11:53 AM

Quote:

Originally Posted by time2shoot

Don't think its you carrier.
I have found out that some AR's are very touchy about the rounds you shoot through them.
I would start by trying .556 ammo.
.223 and .556x45 difer mainly in the presher they creat. Which is the main couse of most AR feeding ishues.

Tried both, same issue.

Mags worked in my M&P, It is possible. I am going to try the colt factory magpul 30 rounder. I was using aftermarket 10 rounders yesterday.

time2shoot · 07-30-2012, 11:58 AM

I would try dif. mags. then. I hope it works.

wv hillbilly · 07-30-2012, 01:43 PM

i agree with the other posts. try a different mag

zant · 07-30-2012, 01:55 PM

Had same problem with new Bushmaster.........I'm not a big AR fan so I called my armorer buddy,he said-"Put the lube to it,you are'nt shooting a mud,blood,crud AK"....lubed it up and viola-never a stutter afterward..

American Leader · 07-30-2012, 02:04 PM

ka64, congrats on your new firearm! I'm sure you will work it out and love your AR. Shouldn't have any problems with the Magpul, they are great mags!

ka64 · 07-30-2012, 03:02 PM

Think I figured it out gents.

I also installed an oversize Mag release, went to my local range and re adjusted the mag release before I arrived.

160 rounds in 20 minutes, not one jam.

We'll see, Thanks for the advice .

gvw3 · 07-30-2012, 04:17 PM

Glad to hear that.

07-30-2012, 09:51 AM	#1
ka64 Advanced Senior Member Join Date: May 2011 Location: Michigan Contributor Posts: 1,412	Advice Please?????? Take the new AR out for some fun, it was not fun!!!!!!!!!!!!!!!!! First 10 rounds flawless, after that bolt would jam 3/4's closed. Did this several times before I said Fudge it. Problem is I put a new Nickel Boron Carrier in it. After a process or elimination I believe its a headspace issue. Brand new Colt 6720, FailZero Nickel Boron Carrier. Bolt cycles fine racking in & out ammo without pulling the trigger. Colt is 556, ammo is PMC 223 & 556. Bolt fires one round, ejects the case & jams 3/4's closed on inserting the next round. No visible wear or stress on the spent round. Any Ideas????????????????? -->

07-30-2012, 11:06 AM	#2
hunter29180 Advanced Senior Member Join Date: Jan 2011 Location: in a motorhome where ever we park! Contributor Posts: 1,627	Re: Advice Please?????? have you changed mags? is the feed ramp smooth and shinny..(in other words has it been polished to reduce drag and to align it to the bore)..others will be along shortly who know a whole lot more than me! __________________ As I get Older, I have come to understand why our Founding Fathers chose our countrys motto to be "IN GOD WE TRUST", somehow they knew in the future WE would come to the point that WE COULD NO LONGER TRUST THE ONES WHO RUN IT!

07-30-2012, 11:20 AM	#3
Snakedriver Advanced Senior Member Join Date: Mar 2009 Location: SW. Florida Posts: 1,219	Re: Advice Please?????? Most feeding problems in an AR come from a faulty magazine. Try a different one and see what happens. Then if the feeding issues continue, take a look at your feed ramps into the chamber to make sure there are no burrs. Also, if you are using cheap commie steel cased ammo, throw all of it in the trash and try some real brass cased ammo. The cheap stuff will gum up your machine on the chop-chop! ETA: I see you're using PMC Ammo, so that's good. It could be a break-in issue. Did you clean the gun good after you got it and lube everything well prior to you range trip? __________________ Fear is a reaction..........Courage is a decision Last edited by Snakedriver; 07-30-2012 at 12:56 PM..

07-30-2012, 11:36 AM	#4
time2shoot Advanced Senior Member Join Date: Jan 2012 Location: Brandon SD Contributor Posts: 2,600	Re: Advice Please?????? Don't think its you carrier. I have found out that some AR's are very touchy about the rounds you shoot through them. I would start by trying .556 ammo. .223 and .556x45 difer mainly in the presher they creat. Which is the main couse of most AR feeding ishues. __________________ I AM A VETERAN MY OATH OF ENLISTMENT HAS NO EXPIRATION DATE!

07-30-2012, 11:58 AM	#6
time2shoot Advanced Senior Member Join Date: Jan 2012 Location: Brandon SD Contributor Posts: 2,600	Re: Advice Please?????? I would try dif. mags. then. I hope it works. __________________ I AM A VETERAN MY OATH OF ENLISTMENT HAS NO EXPIRATION DATE!

07-30-2012, 01:43 PM	#7
wv hillbilly Advanced Senior Member Join Date: May 2012 Location: mountains of wv. Posts: 2,017	Re: Advice Please?????? i agree with the other posts. try a different mag

07-30-2012, 01:55 PM	#8
zant V.I.P. Member Join Date: Sep 2009 Location: S.Al Posts: 248	Re: Advice Please?????? Had same problem with new Bushmaster.........I'm not a big AR fan so I called my armorer buddy,he said-"Put the lube to it,you are'nt shooting a mud,blood,crud AK"....lubed it up and viola-never a stutter afterward..

07-30-2012, 02:04 PM	#9
American Leader Advanced Senior Member Join Date: Mar 2011 Location: Iowa Contributor Posts: 1,630	Re: Advice Please?????? ka64, congrats on your new firearm! I'm sure you will work it out and love your AR. Shouldn't have any problems with the Magpul, they are great mags!

07-30-2012, 03:02 PM	#10
ka64 Advanced Senior Member Join Date: May 2011 Location: Michigan Contributor Posts: 1,412	Re: Advice Please?????? Think I figured it out gents. I also installed an oversize Mag release, went to my local range and re adjusted the mag release before I arrived. 160 rounds in 20 minutes, not one jam. We'll see, Thanks for the advice .

07-30-2012, 04:17 PM	#11
gvw3 Advanced Senior Member Join Date: Oct 2011 Location: Chicago IL Area Contributor Posts: 3,287	Re: Advice Please?????? Glad to hear that. __________________ Criminals advocate stronger gun laws to foster a safer work environment. This limits their exposure to risk.