Quality HBAR upper suggestions?

DaemonAssassin said:

Dwell time in the bore after the gas block helps in ensuring the correct amount of gas for cycling all powder charges. The longer the dwell time, the more consistent the gas pressure will be in the gas system. By shortening the dwell time, you run into a host of issues, like undergassing. Why is it that the M4 uses a carbine gas system? Because it cycles with most if not all ammo the US military gets it's hands on.

Do you build your AR's or do you buy them?

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Invicta said:

Buy. The M4 uses a carbine length gas system because at the time it was designed, that was thought to be the best option. If carbine gas was still the correct answer, why does the URGI use a mid length? Longer dwell time can also lead to increased bolt wear.

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DaemonAssassin said:

I don't buy, I build.

The dwell time is to allow the gas pressure to get high enough to allow the bolt to cycle, before the bullet exits the course and the pressure drops significantly.

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clandestine said:

-BCM Upper
-Criterion HBAR
https://criterionbarrels.com/products/ar-15/ar-15-hbar-contour-barrel/

....

Have the upper assembled by someone that has the proper tools, gauges, and understands how to pull maximum reliability and precision from the weapon.

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randyho said:

First heard on criterion (I'm not a serial shopper). Other than offering matched bolts (non-trivial), what's the draw? I see a grendel barrel/bolt combo that's speaking to me.

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benjaminmartin said:

Noob question, so are heavy barrels interchangeable with standard barrels on AR uppers? Delton has a sale for HBAR
https://www.del-ton.com/ProductDetails.asp?ProductCode=KT1002

I'm not really aware on the mechanics of the gun, would simply changing out the barrel improve accuracy? Or are there other criteria?

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winch said:

Rock River Arms makes a nice upper.

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KRC said:

Not a "bargain" HBAR barrel barrel at $260-$300, but also not requiring expensive chambering and crowning like match grade barrel blank. These barrels are 416R SS, cryo-treated, hand lapped, air gauged, and chambered in .223 Wylde. Downside is weight. Legal in MD.

https://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_ID=1336

Check youtube.com for reviews and videos of these barrels. I have two RRA Varmint barrels, and they are both very accurate with minimal fouling.

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Juche90 said:

Don’t support this business.

https://bearingarms.com/david-l/201...y-and-rock-river-arms-sell-out-illinois-ffls/


Sent from my iPhone using Tapatalk

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Naptown52 said:

The upper on my AR is RRA. They definitely take the "Heavy" in HBAR very seriously. Thing weighs a ton.

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