Any ideals or options?

On my last trip to Fort Dix, I experience a FAILURE TO FEED (FTP) on every single round when using Brown Bear Ammunition 223 Remington 55 Grain hollow point (Lacquer Coated Steel Case).  But NO issues when change over to brass casing ammo.

 

Rife = Bushmaster AR 15 A2 20"barrel with metal (original) magazine.

The rifle is cleaned and oiled however recently replaced the stock  to Magpul MOE rifle stock ( a drop-in  replacement).  I don't believe the stock will cause this.

I hate to sound so obvious but don't use steel ammo!! Use what works! Alot of guns don't like steel. I have never run it in any of my AR's so I don't know if it will run or not. I do know if any of my guns don't like a certain ammo, I don't use that type of ammo steel cased or not.

A buddy of mine will squirt a little case lube on steel cased ammo when he uses them in his AR (bushmaster, I believe). But as FLHX said, if you can, go for brass cased ammo on your AR.

Seems your gun doesn't like that ammo. I was reading many old threads on steel cased ammo last night and opinions seem to be split. I have run several different kinds of steel cased through my AR (Spikes lower, BCM upper) and have not had a single issue. I have tried many different kinds of ammo through it because I want to know what it can or can't cycle. You never know what sort of ammo situations may develop and what you can get may only be surplus steel. I would want to know before a situiation like that came up. Personally If I had a gun that was very picky with ammo I wouldn't be looking to replace the ammo I would be thinking about replacing the gun itself.

what kind of feed problem is it? Does it get jammed against the round in the magazine? Does it not travel far enough back to to catch the next round? Does the next round jam while trying to chamber?

The problem is ... after firing the first round the next round does not get chamber.

However, the cartridge does eject.

 

Maybe the rifle is getting old.

The steel cased ammo is underpowered and causing the action to not cycle completely.  Steel cased ammo is cheap stuff so it's generally loaded on the light side of spec.  This causes it to not cycle completely in some guns depending on the gas port size, gas system length, action spring, and buffer combination.

The problem is ... after firing the first round the next round does not get chamber.

However, the cartridge does eject.

 

Maybe the rifle is getting old.

It's actually a good thing when considering the rifle getting old. I would rather it be harder to cycle the action, than be too easy. If you're set on using the ammo, you could try a lighter buffer. it might be enough to help.

Good to know. Thank you everyone!

you need a lighter buffer.  the bolt is short cycling and not stripping the next round.  at least that is what it sounds like the problem is.

 

this is odd because as a generality, BM have larger than needed gas ports causing them to be over gassed, not undergassed.  shooting Wolf almost exclusivly I had to put a heavier buffer in my BM (carbine gas system)  Your gun being a 20" barrel, I would imagine having a rifle length gas system.  Do you have an A1/A2 stock with a rifle buffer?