Well first issue is my barrel discolored... almost to a white. Other issue is the recoil is not what it used to be. Granted she only has 350 rounds down the tube.. but my shoulder was actually bruused up after shooting 100 rounds. Tried contacting psa since it is there rifle build kit but a week of no answers and many calls and emails leaves me to ask you guys.

 

Ar is a psa mid length chf build kit with a battle comp and a spike tactical lower.

 

Pics when i get a chance

Check you gas block and gas tube. I'm betting the white is gas and powder residue leaking from your gas block or gas tube.

 

What ammo are you using.

This is a 5.56 rifle? I've shot several hundred rounds at a time and never had a concern with recoil let alone bruising.

 

Is it the whole barrel or just by the muzzle?

I have to pop the handguards off but as of right now just infront of my gas block/a2 site.

Pic of the discoloration? I'm with Vlad on this and thinking it's powder/residue.

I wiped it down with hoppes and gave it a good coat of oil... still mis colored. When i get home ill have to get a pic. Sitting at a nephews play at the moment. Im wondering if the gas tube maybe clogged... causing the increased recoil. Its my first build so im clueless

Guessing it is still gases escaping, they will stain/discolor/wear the finish off the barrel.

Ok. So ill pop off the gas block and pop.out the role pin to remove the gas tube and re install. Its just odd that the first 200 rounds had no recoil and now it like shooting a 20g. I dont wanna have to pop my comp off to send it back to psa either (if they ever get back to me) so ill try that for now

Does it look like this?

 

 

Barrel on the left was fired twice however the bolt wouldn't unlock due to the extension being out of spec. Barrel on the right is brand new.

Same color but the entire exposed area of the barrel is that way...

What does the bolt have to do.with it?

What does the bolt have to do.with it?

I only mentioned it because of the excessive buildup after only two rounds. Because the bolt didn't unlock, more gas than normal exited between the block and barrel.

 

Is your gas block pinned on or a set screw? I'm wondering if the ID of the gas block isn't a little oversized and more gas than normal is escaping but not enough to cause cycling issues.

Its held in by 2 pins by the removed bayo lug. That would cause a heavy recoil cycle to also right?

Its held in by 2 pins by the removed bayo lug. That would cause a heavy recoil cycle to also right?

Not necessarily. I'd take a look at the surface of your buffer to see if hasn't been battered or otherwise physically damaged while cycling.

Ok. So ill check and make sure the gas hole and thegas block line up the best i can... re assemble and ifnl its not fixed ill.harrass psa until they respind

Also check that the gas block was installed straight. Years ago I bought a barreled upper where the front site was mounted about 5-7 degrees off. That was pretty much a send it home and try again, because the drilled taper pins were off-center.

 

Check your gas tube for blockages, bents, damage at the bolt end. Is your action functioning properly when hand operating it? No binding, no excessive friction? I'm wondering if the issues is in the gas system or in the bolt/bolt carrier/recoil area. If your bolt refuses to move for whatever reason (like excess pressure) your gas has to go somewhere.

 

Also what ammo are you using? might the ammo be overpressure?

Federal xm193. Ill try what you said. I doubt the fsb is off center ... at she didnt need much adjustment to site her in

Well I'll suggest what gave me shoulder bruising with my ar. It was being over aggressive with shouldering it. Unless you have some kind of illness that makes you bruise incredibly easy, .223 out of a >6lb rifle won't be bruising you.

were they reloads?

No factory loads i purchased threw psa

Any updates to this?

In for pics of the discoloration and face of buffer. Did you put the upper together yourself or did you buy it complete? What kind/weight buffer are you using? Check the buffer spring for anything abnormal and measure its length.

I figured out the discoloration... well i removed it...cant figure out how to post pics. It wasnt from the gas block i removed the gas block and it was clean under neath and started about 1/2" past it. . as for the heavy recoil the nylon part of my buffer was off.. and no role pin insite for it.. so.it was binding the spring. I ordered a new spikes buffer and i will retest and see whats happening. Hopefully it fixes it.

I figured out the discoloration... well i removed it...cant figure out how to post pics. It wasnt from the gas block i removed the gas block and it was clean under neath and started about 1/2" past it. . as for the heavy recoil the nylon part of my buffer was off.. and no role pin insite for it.. so.it was binding the spring. I ordered a new spikes buffer and i will retest and see whats happening. Hopefully it fixes it.

If you have a google account, you can just upload it to Google Drive and allow anyone with the link to view it... then copy+paste the link here to JUST your photo.

 

Or click the More Options link where you are going to post a reply and select [bROWSE] under ATTACH FILES, navigate to your photo, click on ATTACH FILE and then ADD REPLY.

Here is the before pic tomorrow ill do my best to do an after

It looks freezer burnt.

Yea. Wondering why. But clp fixed it

Did you use some type of chemical to clean the barrel before you shot it? Maybe enough of it was left on it when you fired it and when the barrel got hot it turned that way. Weird....

Maybe some hoppes only cleaning solvent i use

I still think that is gases being shot from the gas block. Have you disassembled the gun and checked for obstructions yet?