If you wanted to build a really accurate centerfire semi-auto, what would you build?

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Springfield Armory M1A! End of discussion. Take your pick:
Match ?
Super Match ?
Ultra Match ?
M21 Sniper ?
GYGS Carlos Hathcock Comemoritive "White Feather" model?
Chrome-Moly bbls?
Kreiger SS bbls?
Wood stock or Synthetic?
They will put together any set-up that you want!
 
Already done.

As sold to Uncle Sam and his special ops guys by ArmsTech, LLC. A revamped Browning BAR sporter in .300 Win Mag, with one-piece McMillan stock, heavy stainless barrel, U.S. Optics glass, and detachable M1918 BAR magazine capability:

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Yote, the gas system is still there.

Just like it was under the forend in the two-piece stocked BAR. The one-piece synthetic McMillan stock just makes for a more stable platform.

Unless you're confusing it with the older military M1918 Browning BAR. The gun pictured above is a reworked commercial BAR sporter, not the old WWI-WWII era full auto M1918, which is almost totally unrelated (save for the name).
 
Some months back someone had a picture of a semi-auto rifle that was chambered in 338 lapua.

I think the link said it ran about 5 grand or so. I did not keep the link for fear I might sell the house to be homeless and living at the shooting range with my new toy.
 
I'd go AR-15 in .223. It's the semi-auto with the best cost to accuracy ratio. This will probably require the least amount of gunsmith intervention. You could build from parts and save a few bucks. Depending on what you want such as barrel length (16, 20, 24, or something else), handguards (standard or straight through), trigger, barrel manufacturer, it may just be best to build from parts.

If you want to have some real fun, go with an M1 Garand. Get yourself a rack grade Greek issue from the CMP, have it reworked by a real gunsmith and get yourself a nice .308 Krieger barrel for it and a DGR stock. People will recognize the righteousness.

M14s are nice too, but it will cost a lot of money to get them anywhere near as accurate as an AR. We're talking about getting a good receiver from someone like Fulton Armory and rebuilding with milspec parts. Go with a Kreiger barrel and send it to McMillan to get it bedded into one of their stocks.

Now that I think about it, I really feel like rebuilding a Garand...
 
High end AR-15's will do 1/4 minute groups for a reasonable price. I know of no other centerfire semiauto's that will do that without CRAZY tweaking. Read The Rifle Shooter by David Tubb, in there he goes into the trials and tribulations of trying to get his SR-25 in 6.5-08 as accurate as can be... long story short he couldn't beat 1/2 min groups. "really accurate" is a relative term. If you mean MOA, you have a million options, 1/2 minute, a few, 1/4 minute, think words like "Fulton Armory, JP, and Medesha".

atek3
 
Seconded the WOP AR-15. Use the few grand saved over the other exotica to buy ammo and get really good at shooting the thing.

Quite frankly, a 1/2 MOA semi-auto is a pretty good rifle. An AR-10 in 6.5-308 or even modified for the 6mmX would be a nice rifle, capable of doing most anything most of us will ever actually use a rifle for (actually, the .223 is adequate also), but it won't come as cheaply as a .223/5.56 AR-15.
 
The AR15 is tough to beat for ease of building and inherent accuracy of the finished product. If I were going to be the one building it, it would pretty much be the only option since anything remotely competitive with it would be much more complex to build to the same level of accuracy.
 
I'm saving up for an Oly Arms .243 WSSM upper. Owners on AR15.com have reported good luck with them. Relatively light and handy gun for something semi-auto and supersonic out to at least 1000 yards with the heavier bullets.

I'm using varminting as an excuse for getting it ;)
 
Start with the US Rifle Cal .30 M1, service grade from CMP, then build up to National Match grade.

What else could you want? A huge chunk of history, the 8-BLAM PING! Song of The Garand, in .30-06, so you are good out to rediculous ranges.

Or re-barrel with a really good Kreiger (sp??) in .308, and add the mag spacer block..WOOOO HOOO
 
While you have to work and spend lots of $$$ to get more conventional rifles like the M14 to a certain level of accuracy, you'll be hard-pressed to build an inaccurate AR15 as long as you start with a good barrel and don't grossly screw up assembly.

Yes, it's basic "in your basement with instructions off the internet and $50 worth of tools from Brownells assembly", not the kind of extensive gunsmithing, fitting, and bedding required to get an M1 or M14 to the same level.

The AR10 is just the big brother to the AR15, basically identical in design. The same pattern holds. Start with a good barrel and you'll more than likely end up with an accurate AR10, everything else being "stock."

The AR10 also has clear advantages with regard to optics mounting ergonomics vs. an M1A.

-z
 
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