Berrett Rec 7

Yes, you can attach any AR15 upper to the REC7.

CmdrSlander said:

Yes, you can attach any AR15 upper to the REC7.

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X2. No sweat.

The bolt carrier on the REC 7 is specifically built for the Barrett piston system. The bolt carrier is also matched to the lower. So, it's not quite as straightforward as it first appears to change uppers. It is NOT the same as a DI AR converted to a piston system, the Barrett is designed as a piston rifle.

To use a DI upper, you will have to change the bolt and bolt carrier as the bolt + carrier will not work with DI uppers, and may not work with other piston uppers as the Barrett piston and bolt system is proprietary to Barrett. There is a little cup on the Barrett bolt carrier that matches up with the piston rod. So, a different piston upper would have to have the correct length piston rod AND stroke length to drive the bolt correctly.

I had my REC 7 disassebled earlier today, and I'm not sure you could put a different bolt in it as Barrett has incorporated an anti-tilt system into the bolt carrier and lower. Without a standard AR bolt + carrier to test in the lower to see if the Barrett is compatible with other AR parts, I wouldn't assume interchangeability with other uppers.

Likewise, the Barrett upper needs to have a matching bolt+carrier in the lower in order to work properly. While all of the pin holes in the uppers and lowers are standard and will mate up with other AR's - whether they will work without the Barrett bolt + carrier is the real question.

An upper receiver assembly in DI and/or a different cartridge should pin on. Not sure how you mean that the carrier is matched to the lower.

You are right that if using a DI assembly you will not be able to reuse the Rec7 carrier or bolt (no gas key or rings).

A REC7 lower is completely standard so is compatible with any other upper.

REC7 uppers are available separately, fwiw.

The Barrett REC7 6.8 SPC A3 flattop upper assembly is a complete pin-on upper any standard AR-15 lower.

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http://www.midwayusa.com/product/78...rail-free-float-handguard-flash-hider-pre-ban

barret is nice,but they are real proud of the prices on them also

A REC7 lower is completely standard so is compatible with any other upper.

REC7 uppers are available separately, fwiw

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The question with the Barrett is not whether the lower is "standard" - it is from physical compatibility standpoint - the problem is with the bolt and carrier not being compatible with anything but a Barrett upper.

I think there is an owner's manual available for the gun online. It has an exploded view of the bolt and carrier. Look at the way the bolt and carrier are configured and you'll see the problem with compatibility with anything other than a Barrett upper unless you change the bolt and carrier.

My point is - unlike a previous post in this thread, it's not exactly - "X2. No sweat."

Meaning, you can pin on your favorite DI upper and pull the trigger and have it work. It won't.

Or, the reverse WHICH THE OP ALSO ASKED ABOUT - putting a Barrett upper on a different reciever - also won't work unless you have the Barrett bolt and carrier.

barret is nice,but they are real proud of the prices on them also

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As far as I can tell, the Barrett price is in line most other high end piston ARs. I paid $1770 for mine.

buckhorn_cortez said:

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The question with the Barrett is not whether the lower is "standard" - it is from physical compatibility standpoint

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Negative. This is was the OPs question:

...would the Barrett upper on the rec 7 fit any of the other ar15 receivers?

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The answer is an unequivocal yes.

buckhorn_cortez said:

- the problem is with the bolt and carrier not being compatible with anything but a Barrett upper.

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That isn't a problem.

Locking lugs wear in to match the barrel extension, its generally considered a bad idea to go swapping a bolt between barrels. The least worst thing that can happen is wildly accelerated wear and broken lugs.

To reiterate, to keep things copacetic each upper needs its own dedicated BCG.

The question with the Barrett is not whether the lower is "standard" - it is from physical compatibility standpoint

Negative. This is was the OPs question:


Quote:
...would the Barrett upper on the rec 7 fit any of the other ar15 receivers?

The answer is an unequivocal yes.

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The upper will attach to any other receiver. YES. Will the upper work with any other recieiver? NO - not unless it has the Barrett bolt and carrier.

Quote:
Originally Posted by buckhorn_cortez
- the problem is with the bolt and carrier not being compatible with anything but a Barrett upper.

That isn't a problem.

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You'll have to explain this past saying, "This isn't a problem" How, exactly, will a Barrett bolt and carrier work with a different upper - particularly a DI upper? It won't as the bolt is a completely different design than a DI bolt.

Locking lugs wear in to match the barrel extension, its generally considered a bad idea to go swapping a bolt between barrels. The least worst thing that can happen is wildly accelerated wear and broken lugs.

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This has nothing to do with the bolt lugs and everything to do with the design of the carrier and it's compatibility with the piston system.

Again, you'll have to explain to me in detail how you match up another upper with the Barrett bolt carrier. Or, the reverse, how do you match the Barrett piston system to a differently designed bolt carrier group?

buckhorn_cortez said:

Or, the reverse WHICH THE OP ALSO ASKED ABOUT - putting a Barrett upper on a different reciever - also won't work unless you have the Barrett bolt and carrier.

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Correct. The firearm will not function without the installation of major sub-assemblies.

Luckily the purchase of a REC7 upper includes the proprietary BCG.

buckhorn_cortez said:

Or, the reverse, how do you match the Barrett piston system to a differently designed bolt carrier group?

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You don't.


Each upper requires its own dedicated BCG, regardless if its a DI, Adams Arms, or some other variant.

Buckhorn, I think maybe you believe your Barrett is some specially engineered exception to the AR platform. It is not. True, you need to use the Barrett BCG with it, and that BCG won't function in a DI gun, but this is true for ANY of the piston AR's as there is no industry standard. Beyond that minutia, it is like most any other AR.

The Barrett Rec7 is a quality gas piston operated AR pattern rifle. Like the other AR rifles, you can pop 2 pins, slap on another type of upper receiver assembly (complete with its own BCG like the majority of uppers), and rock. No sweat.