AR 15 short cycling

[JRuby]

This is an area I am not versed in. I was trained on the M14 but I am learning about the AR15. I have a Delton Sport that the more I shot it the less it wanted to cycle properly. It is acting like it is not pushing the bolt back enough to chamber the next round. I know it is a budget rifle but that's why I bought it. I believe the problem is that the gas system is partially blocked. How do I maintain the gas system and how do I clean it? Another question is if I use the rifle in inclement weather how do I keep it from rusting under the perforated forend on the rifle? I know to those that understand the platform these are probably stupid questions but I appreciate the help.

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[FATAL125]

Are you using factory loads or hand loads?

How many rounds fired?

Have you given it a thorough cleaning at all?

Is it a complete delton or a delton upper and different company lower?

There could be a multitude of reasons that would cause this. Some extra info may help direct the next course of action.

 

[FATAL125]

How do I maintain the gas system and how do I clean it?

No real maintenance is needed here. The high heat and high pressure of the gases going through there are enough that nothing can build up. You want to watch for build up at the end of the tube where it mates to the BCG and keep that clean, but that's about it.

Another question is if I use the rifle in inclement weather how do I keep it from rusting under the perforated forend on the rifle?

Disassemble and clean/dry once home from said trip.

 

[JRuby]

Are you using factory loads or hand loads?

How many rounds fired?

Have you given it a thorough cleaning at all?

Is it a complete delton or a delton upper and different company lower?

There could be a multitude of reasons that would cause this. Some extra info may help direct the next course of action.

I have shot several hundred rounds through it and it has been very reliable up to this point. I will tear it apart and give it a good scrubbing. I was using PMC Bronze from Bimart. This was a complete build. It has worked well until I took friends shooting. It was my first AR and figured I could upgrade it if needed.

 

[JRuby]

Thanks for the information @FATAL125

 

[FATAL125]

I have shot several hundred rounds through it and it has been very reliable up to this point. I will tear it apart and give it a good scrubbing. I was using PMC Bronze from Bimart. This was a complete build. It has worked well until I took friends shooting. It was my first AR and figured I could upgrade it if needed.

Yep. Start with a good cleaning and soak the bolt and carrier overnight if its been a while since last cleaning.

I have read that delton had some extractor spring issues. May be worth getting a new stronger spring and replacing that. Cheap and will at least eliminate that potential issue point.

 

[JRuby]

Midway has some bolts on sale might as well pick one of them up on payday.

 

[JRuby]

Yep. Start with a good cleaning and soak the bolt and carrier overnight if its been a while since last cleaning.

I have read that delton had some extractor spring issues. May be worth getting a new stronger spring and replacing that. Cheap and will at least eliminate that potential issue point.

It is extracting fine it just does not go back enough to pick up the next cartridge. If you manually cycle all works well

 

[Twodogs]

Clean and lube, try different ammo.

 

[homeuser6]

my ARs prefer to run wet. if that doesn't do it ,check the gas block alignment.

 

[TTSX]

Need more gas or less mass

 

[hongkong2]

I run new AR's sloppy wet for the first couple of hundred rounds and they all ran fine after that.

 

[powermad]

I have shot several hundred rounds through it and it has been very reliable up to this point. I will tear it apart and give it a good scrubbing. I was using PMC Bronze from Bimart. This was a complete build. It has worked well until I took friends shooting. It was my first AR and figured I could upgrade it if needed.

The PMC bronze is on the weak side of .223 ammo.
If the gas port is on the smaller side or there is a leak in the gas system then it won't cycle well.

 

[DirectDrive]

Don't use civilian .223 ammo unless the rifle is well broken in.
It's usually loaded to a lower pressure than military ammo.
Instead use full power XM193 or M855 in a new rifle.
Keep the BCG and BCG tunnel wet with CLP.

 

[arrowshooter]

Make sure your gas block is not loose.

 

[3MTA3]

@JRuby welcome to the dark side! Check out the School of the American Rifle channel on Youtube for all kinds of info on this platform: https://www.youtube.com/@SchooloftheAmericanRifle

Like others have said clean and lube and make sure the gas block isn't loose. If you have a bore scope you can check to make sure the gas block is properly aligned.

Add check the gas seals and don't forget to remove the buffer and spring. Clean and lube the spring. Also look for evidence of the bolt carrier striking the lower receiver near the barrel extension.

As far as a bolt goes, the best value is the Sons Of Liberty Gun Works (SOLGW) or it's identical twin from Sionics. These are duty grade BCG's and each one is HPI and MPI tested. Most BCG's that get these tests only have one per lot. They run about $160 and Brownell's has the SOLGW. They are also very efficient with gas key and ring areas providing excellent seals.

 

[JRuby]

@JRuby welcome to the dark side! Check out the School of the American Rifle channel on Youtube for all kinds of info on this platform: https://www.youtube.com/@SchooloftheAmericanRifle

Like others have said clean and lube and make sure the gas block isn't loose. If you have a bore scope you can check to make sure the gas block is properly aligned.

Add check the gas seals and don't forget to remove the buffer and spring. Clean and lube the spring. Also look for evidence of the bolt carrier striking the lower receiver near the barrel extension.

As far as a bolt goes, the best value is the Sons Of Liberty Gun Works (SOLGW) or it's identical twin from Sionics. These are duty grade BCG's and each one is HPI and MPI tested. Most BCG's that get these tests only have one per lot. They run about $160 and Brownell's has the SOLGW. They are also very efficient with gas key and ring areas providing excellent seals I have some other pieces I need from Brownells. I will look into them , thank you.

 

[40nascar]

I have shot several hundred rounds through it and it has been very reliable up to this point. I will tear it apart and give it a good scrubbing. I was using PMC Bronze from Bimart. This was a complete build. It has worked well until I took friends shooting. It was my first AR and figured I could upgrade it if needed.

Pmc bronze is .223, and about 300 fps less velocity than M193 spec 5.56. It's possible that the gas pressure generated in your AR is marginal for cycling this ammo. IF your AR is fairly low in number of rounds fired through it, it may not be broken in yet, to smooth out the internal friction surfaces. Also, make sure there is adequate lubrication on the Bolt carrier. AR's do not like to be run dry.

Try using some 5.56 factory ammo before going on a wild goose chase.

 

[Duneblaster]

You could have a leak somewhere in the gas system. Delton uses YFS (Taiwan) fasteners so the gas key might be loose or the head(s) of the fastener(s) could've snapped off. The dimensions inside the carrier could be out of spec. Check the carrier by standing it up on a table and see how fast the bolt collapses into the carrier. There's a high chance the inside of the carrier has tooling marks/grooves and they chewed up the gas rings. If you have another BCG I'd try that n' see if it fixes your rifle.

 

[JRuby]

Took "Gun Scrubber" to it yesterday and was amazed at the amount of debris that came out of that action. Lubed it all up and hopefully will work better at the range next time. Thanks all for the guidance.