building a precision AR

[yorketransport]

I'm getting ready to assemble a precision AR just to have something different to shoot out to about 1000 yards for informal plinking. I have the barrel/bolt (6.5 BRX) and a side charger upper/matched lower. Where I'm a little out of my element is when it comes to parts like the trigger and lower parts kit. I have a few friends who are very successful local 3 gun shooters who have given me their recommendations for triggers and parts, but I'm curious what other more precision oriented shooters use. I'm doing my best to stay away from the tactical look!

Let me know what has or hasn't worked well for you. I'm much more experienced with bolt guns, so this is a little out of my comfort zone. That was kind of the point though!

Andrew

 

[Dusty Stevens]

Geissele is the trigger to have

 

[akajun]

Geisslle 2 stage match trigger , lpk from any of the big makers is fine. The key to accuracy with ar's is quality barrel and ff tube .
Can you fit a brx in a standard ar or do you have to go ar10.

 

[284driver]

Ar15 will accept br and variants.

 

[akajun]

Ar15 will accept br and variants.

I did not know that, I have never seen a 6br ar, most people do 6mm Hagar or 240 tomahawk when they do a 6mm space gun .
One last thing, if your gonna be shooting hot loads look at using an extended gas system , you can get the tube from WOA. That is unless you already drilled the gas port

 

[johnfred1965]

Take a look at Robert Whitley's site: 6mmAR.com, he has lots of info on making an AR shoot

 

[yorketransport]

Geisslle 2 stage match trigger , lpk from any of the big makers is fine. The key to accuracy with ar's is quality barrel and ff tube .
Can you fit a brx in a standard ar or do you have to go ar10.

AR Performance made the barrel and it came with one of their 800 series bolts and barrel extensions. When I started this project I was talking with a friend about what the best long range chambering is for an AR 15 and he kept saying that the Grendel was top of the heap. I have a CZ 527 in 6.5 Grendel and it's a neat little cartridge, but hardly a ballistic juggernaut. ;D My first question to him was whether or not a BR case could function in an AR. After a little digging I found the AR Performance website and saw his 6.5 BRX barrels. If a BR was a good idea, then a BRX must be better!

Take a look at Robert Whitley's site: 6mmAR.com, he has lots of info on making an AR shoot

I just checked out that site and there's a ton of good info on there. Thanks!

I think I'll end up just running a standard A2 butt stock, but what about buffers and springs? Is there anything special I should be looking for? Would this have any significant influence on accuracy or just function?

 

[mac86951]

Geisslle 2 stage match trigger , lpk from any of the big makers is fine. The key to accuracy with ar's is quality barrel and ff tube .
Can you fit a brx in a standard ar or do you have to go ar10.

AR Performance made the barrel and it came with one of their 800 series bolts and barrel extensions. When I started this project I was talking with a friend about what the best long range chambering is for an AR 15 and he kept saying that the Grendel was top of the heap. I have a CZ 527 in 6.5 Grendel and it's a neat little cartridge, but hardly a ballistic juggernaut. ;D My first question to him was whether or not a BR case could function in an AR. After a little digging I found the AR Performance website and saw his 6.5 BRX barrels. If a BR was a good idea, then a BRX must be better!

Take a look at Robert Whitley's site: 6mmAR.com, he has lots of info on making an AR shoot

I just checked out that site and there's a ton of good info on there. Thanks!

I think I'll end up just running a standard A2 butt stock, but what about buffers and springs? Is there anything special I should be looking for? Would this have any significant influence on accuracy or just function?

A2 buttstock is straight forward as is buffer and spring. If you are planning on shooting off bags, check out egw bag rider or choate A2 stock. Fulton armory has an adjustable butt pad.

Save brass with an adjustable gas block, not required but let's you tune the timing to prevent case head swipe.

-Mac

 

[nmjwolf]

Geissele is the trigger to have

This ^^^^^ x2

 

[johnfred1965]

Don't know from personal experience, but IIRC, service rifle competitors favor a heavier recoil spring or buffer to insure the bolt does not unlock until the bullet is well out of the barrel, preventing barrel movement while the bullet is still in the rifle. I don't know if this would have the same importance shooting from a bench or prone longrange.

 

[Dusty Stevens]

And they like the JP buffer systems to cut back on some of those weird vibrations

 

[akajun]

And they like the JP buffer systems to cut back on some of those weird vibrations

Not true, we prefer tried and true a2 springs and regular a2 buffers.

 

[akajun]

Don't know from personal experience, but IIRC, service rifle competitors favor a heavier recoil spring or buffer to insure the bolt does not unlock until the bullet is well out of the barrel, preventing barrel movement while the bullet is still in the rifle. I don't know if this would have the same importance shooting from a bench or prone longrange.

Not true, the only thing we like is m16 carriers for the extra mass , and even that is not a deal breaker . The only reason I suggest an extended gas system on a space gun is it delays unlocking and lowers port pressure so it's easier on brass. By the time a gun unlocks the bullet is already down range on any gun.

 

[yorketransport]

And they like the JP buffer systems to cut back on some of those weird vibrations

Not true, we prefer tried and true a2 springs and regular a2 buffers.

Any particular reason why? Are they better than the others, or do the others just not offer an advantage?

 

[mac86951]

And they like the JP buffer systems to cut back on some of those weird vibrations

Not true, we prefer tried and true a2 springs and regular a2 buffers.

Any particular reason why? Are they better than the others, or do the others just not offer an advantage?

It's all about timing. We like a longer gas tube and lower port pressure, m16 bolt carrier and a2 buffer and a2 springs for saving our brass from case head swipe. Less case head swipe means possible bigger loads to get to the higher nodes on 223. Tubb has a bolt carrier weight to help with this too.

Most is oriented to getting the most from single loaded 80gr out of a 26"+ barrel, but I've had to use them on overgassed 20" barrels too. Truth is they shoot great, these are methods to save brass as I haven't seen these really improve accuracy, just allow the rifle to operate less violently with hotter loads.

 

[akajun]

And they like the JP buffer systems to cut back on some of those weird vibrations

Not true, we prefer tried and true a2 springs and regular a2 buffers.

Any particular reason why? Are they better than the others, or do the others just not offer an advantage?

two reasons, no real advantage, and Us high power shooters tend to be tightwads, but in a relative way . Will will drop 1k on a new upper in a heartbeat , but buy new commercial brass instead of once fired, are you crazy?

 

[Cold Bore]

Geissele is the trigger to have

And the thread could've stopped after the very first response.