Large frame AR Cycling Issues (Out of Battery)

[B3dlam]

So I have around 160 rounds down the tube on the AR I built up (picture in my signature) I have noticed that it is having issues not going completely into battery when it cycles. It strips a round from the magazine and feeds it into the chamber but it seems to get hung up around the last quarter to half an inch. Usually I will have to manually draw the bolt fully to the rear again and let it slam forward again (as the MaTen upper/lower isnt equipped with a forward assit). I was guessing it might be an issue with my buffer/buffer spring as it seems to be cycling all the way back as it is exjecting spent brass consitently and feeding new rounds its just almost like the spring doesnt have the force to drive the bolt completly back into battery. It currently has an Armalite AR10 buffer and Armalite AR10 Buffer Spring.

I was looking at just upgrading the buffer and spring and seeing if that fixes the issue but I wanted to check here first to see if anyone else had some pointers.

 

[shootist2004]

Re: Large frame AR Cycling Issues (Out of Battery)

are you using factory ammo? have you tried changing mags?

 

[med17]

Re: Large frame AR Cycling Issues (Out of Battery)

+1 on the ammo. If it's reloads could be a resizing issue. Also, is the feed ramp ok and is it happening on every rnd?

 

[sticshooter]

Re: Large frame AR Cycling Issues (Out of Battery)

what caliber?

 

[sticshooter]

Re: Large frame AR Cycling Issues (Out of Battery)

if it's the rifle in the picture it's because it's a 6.5 creedmoor.bullet does'nt lift fast enough to go straight into chamber.large frame ar's shooting 6 and 6.5mm bullets need modifacations done to barrel extensions and magazines to get them not to pound the bullet tip into the barrel extensions to get them to run clean.look for a link on this forum talking ar gas guns ripping bullet tips on 6.5 creedmoor.lot's of good info there.

 

[B3dlam]

Re: Large frame AR Cycling Issues (Out of Battery)

Problem is solved but I will annotate here incase someone has similar issues in the future.

I currently reload as having ammo shipped to an Island in alaska is outrageously expensive and the only ammo they have here is the 129gr SST superperformance which as factory ammo shows signs of overpressure on my rifle.

The issue I had was I was utilizing a Hornady bullet seat die which comes with zero set-up instructions and zero information in the hornady reloading manual I usually load using Lee dies and they are set up per caliber the hornady bullet seat dies are universal to some degree so you have to adjust it diffrently for each case length basically I ended up with one thread to many screwed into the press so when I would seat the bullets it would cause a minute deformation of the case at the bottom of the shoulder it was barely noticeable and I just happened to find it by chance but once I corrected this the rifle has been feeding reliably with zero issues.

 

[problemchild]

Re: Large frame AR Cycling Issues (Out of Battery)

Get one of these. Its a MUST if you reload semi's. Its a minimum sami spec gauge.

http://youtu.be/uhgWqrvdzrU

 

[BLDTYLRY]

Re: Large frame AR Cycling Issues (Out of Battery)

I use the L.E. Wilson Case Gauge for every caliber I load.