Difficulty dry cyling Aero M5 build.

[vintagedude88]

I built an Aero M5 from parts. Aside from the receiver set, I used an Aero BCG and an 18" Aero nitrided heavy barrel made by Ballistic Advantage. I haven't been able to take it to the range but I tried dry cycling some rounds just to check function. In doing so I had difficulty getting the bolt to seat fully on some rounds (weak buffer spring?) and on the rounds that do seat fully, I had to pull very hard on charging handle to extract. Is this because chamber is tight on a new barrel? I didn't have this problem on a previous PSA build but that had a stainless barrel and this one is 4150 steel. Is the steel barrel that much harder that it would make it more difficult to cycle? Would this problem go away once I shoot it and break in the barrel? I'm cycling ZQI M80 if you're wondering about the ammo.

[NATEWA]

When I built my upper (aero m5 with dpms bcg and barrel), it was difficult pull the charging handle and bolt back. The charging handle was replaced because it was so worn. I lubed the heck out of it, pulled the charging handle and bolt back and then hit the bolt release, multiple times. Put a couple of boxes through it and now it’s fine.

I would recommended you go shoot it, clean it and repeat.

[ar15barrels]

The gun was NOT designed to be cycled and function by hand.
The gun was designed to function by gas.
Since your hands don't move the carrier at the proper speed/force that the gas system does, the gun will not function on the bench.
This is no problem of the gun.
This is a problem of the user.

Go fire 200 live rounds to knock off the sharp edges and smooth out the operation.
After that, you can come back here and post if you ACTUALLY have some sort of problem.

[seainc]

I built an Aero M5 from parts. Aside from the receiver set, I used an Aero BCG and an 18" Aero nitrided heavy barrel made by Ballistic Advantage. I haven't been able to take it to the range but I tried dry cycling some rounds just to check function. In doing so I had difficulty getting the bolt to seat fully on some rounds (weak buffer spring?) and on the rounds that do seat fully, I had to pull very hard on charging handle to extract. Is this because chamber is tight on a new barrel? I didn't have this problem on a previous PSA build but that had a stainless barrel and this one is 4150 steel. Is the steel barrel that much harder that it would make it more difficult to cycle? Would this problem go away once I shoot it and break in the barrel? I'm cycling ZQI M80 if you're wondering about the ammo.

There are two o-rings under the extractor, remove one or both and try again and follow "ar15barrels" instruction above.

https://www.aeroprecisionusa.com/308...rier-group-nib
Extractor too stiff,would not let bolt close.
The bolt would not close completely . The problem was the extractor would not let the base of the round set on the bolt face. After taking extractor out found two small o ring washers. Removed one and works fine now.

REVIEW BY WILLIAM
POSTED ON 1/29/16

[ZombieLivesMatter]

Go shoot it first. I've built some AR15/AR10 that seemed like it didn't cycle properly by hand but worked perfectly when live firing and after getting a few shots in cycled fine by hand afterwards.

[vintagedude88]

There are two o-rings under the extractor, remove one or both and try again and follow "ar15barrels" instruction above.

Thanks for the extractor tip. I'll try that.

[vintagedude88]

Since this is a new build, have you lubed it up yet?

Sent from my SM-G965U using Tapatalk

Its got some lube but its not wet. Normally before shooting I would spray it wet with Rem Lube. I guess the answer is "go shoot it"

[vintagedude88]

...
hands don't move the carrier at the proper speed/force that the gas system does, the gun will not function on the bench.
This is no problem of the gun.
This is a problem of the user.

Go fire 200 live rounds to knock off the sharp edges and smooth out the operation.
After that, you can come back here and post if you ACTUALLY have some sort of problem.

Point taken. I kinda panicked because so many post about issues with their 308 builds due to the many incomformities of the platform unlike AR15s. Didn't realize the gas pressure was that tremendous. This one is a rifle gas barrel. I'm hoping it will shoot softer than my previous 308 mid length.

[ar15barrels]

Didn't realize the gas pressure was that tremendous. This one is a rifle gas barrel. I'm hoping it will shoot softer than my previous 308 mid length.

There is about 20,000 PSI of pressure at the gas port on a rifle gassed 223/5.56 type barrel.

[17+1]

[vintagedude88]

I noticed quite considerable scarring too on the bullet heads as well. The lugs are sharp especially by the feed ramps. Would the scarring affect the bullet's flight characteristics? Especially if it were a match round?

[ar15barrels]

I noticed quite considerable scarring too on the bullet heads as well. The lugs are sharp especially by the feed ramps. Would the scarring affect the bullet's flight characteristics? Especially if it were a match round?

Yes.
That's just one of the limitations of an autoloader vs a bolt gun where you have an easier feed path.

[vintagedude88]

Yes.
That's just one of the limitations of an autoloader vs a bolt gun where you have an easier feed path.

Wow, makes me wanna rethink the expectation and purpose of my build.

[ar15barrels]

Wow, makes me wanna rethink the expectation and purpose of my build.

Autoloaders are absolutely great for quick multiple followup shots as you keep missing.
Bolt guns are easier to just make a hit with the first shot.

[17+1]

I noticed quite considerable scarring too on the bullet heads as well. The lugs are sharp especially by the feed ramps. Would the scarring affect the bullet's flight characteristics? Especially if it were a match round?