Change a .223 chamber to .556?

I have a few ARs and all but one are 5.56. The one that is not is a Les Baer Super Varmint chambered in .223. This is a nice rifle with a 20" bull barrel, Picatinny hand guard and a Versa bipod. I bought it new years ago and have never shot it. It’s been sitting in my safe. I was going to sell it and get a full size AR in 5.56 like a Colt AR15A4 (my others are M4 carbine style). Someone I know suggested having the Les Baer rechambered to 5.56. Neither of us know if this can be done or is even a good idea.

What are your thoughts? Thanks

Dumb idea. You haven’t used it in a year… Sell it.

Sell it to someone who thinks it’s special. A single stack 45 lover who recognizes the Les Baer brand but knows nothing about AR 15s will jump on it.

Sell it, get something you’ll shoot.

Also, 5.56, not .556.

.223 is inches, 5.56 is millimeters. .556 would be an awful tiny bullet.

Actually .556 would be a huge bullet

0.556mm would be slightly over half a millimeter in diameter, it’s tiny. Needle-like, I imagine.

556.0, on the other hand, would be massive :D.

I agree, sell it and get something you’ll use. Still, I do wonder if maybe a rechamber to .223 Wylde would be possible - would make an awesome setup I bet.

The 5.56 reamer here http://www.m-guns.com/tools.php ought to do it. Well, not to .223 Wylde of course.
I’d still sell it though.

Sell it and buy a rifle that interests you. The Les Baer sounds like a nice rifle you could get a good price for, especially since it’s never been fired. The best rifle is the one you enjoy shooting the most.

As an aside, aren’t nearly all chambers surface treated or least hardened? So reaming the chamber could grind off the surface treatment and shorten the life of the barrel?

He doesn’t ever state millimeter [emoji14]
And nobody annotates mm with . at the beginning but everybody starts caliber with .
So I win and we both hijacked this thread [emoji3]

Well… you got me there. haha
Gracefully bows out

Shoot it…

I would suggest selling instead of a re-chamber as LB is asking over $500 for new barrels these days. They are good barrels for hunting and precision work, but wouldn’t want to use one for heavy range work or running suppressed. Do you know the twist rate? The SV is offered in 1:7 - 1:12.

If it is new/unfired, I would highly recommend AGAINST modifying it. It could be re-chambered to 5.56, but it is probably not worth the trouble. If you have not fired it in a few years, then you just aren’t that into this rifle. For as much as those Les Baer ARs cost new, sell it so you can buy, or build an excellent example of whatever it is you really want. As it sits (unfired) it is worth a high percentage of its’ original price. Sell it instead of devaluing it and making it into something you sorta want to shoot.

Thank you everyone for the feedback. I’ve corrected the caliber in my original post, a quick typo on my part.

The comments mirror what I thought. Selling it is a better idea than changing it. Hopefully the Les Baer will have good value. It was advertised as having 1/2 MOA accuracy at 100 yards and came with a target from test firing showing that accuracy. Comes with a soft case, Jewel trigger, 20" bull barrel, full Picatinny hand guard and a quick detach Versa bipod. I even have the original Les Baer box it shipped in. Anyone have an idea what a good price would be?

Keep an eye on the Equipment Exchange. When I get home next week I will be listing it for sale and then getting something like the Clot AR15A4 which I will shoot. Thanks again.

If I were you I would list it at Snipershide. There a lot more guys that care more about accuracy and less about combat readiness than here. Maybe think about Gunbroker too. If you go that route I can put you in touch with guy who does GB auctions for a living. He knows how to photograph, price and market guns. He has sold several guns for me at prices for more than I thought they were worth. He has an FFL so you can feel safe shipping them to him.

If you keep it, I wouldn’t re-chamber it, the .223 chamber will be the most accurate provided you use .223 ammo. It isn’t a combat type of rifle, but a varmint rifle. Or, sell it and fund a sweet SPR.

Thanks, I haven’t been on Snipershide since it changed to Scout. My log in doesn’t work any more, maybe I need to reregister since it’s now Scout. I’ve bought on Gunbroker but have not sold there. I may be in touch. Thanks for your offer. I just don’t know what price to ask.