Comparison Chart of Major AR Brands

[C4IGrant]

I know that's true of the Rock River Arms AR's, but the Bushmasters that have the 1/9 twist barrels handle 5.56x45mm ammunition just fine. I know my Bushmaster does.

Ever run MK262 through your BM?

I have reamed a good number of BM chambers and found them to generally be 223 wylde.

Another ugly fact about some BM barrels is that either the threads on the barrel are off center or the barrel was reamed off center. Why this is important is because if you want to mount a can on the barrel, you may just find that you will have to replace the can after one shot (as you have a new exit hole). :-(



C4

[Jack_Stroker]

Ever run MK262 through your BM?

I have reamed a good number of BM chambers and found them to generally be 223 wylde.

Another ugly fact about some BM barrels is that either the threads on the barrel are off center or the barrel was reamed off center. Why this is important is because if you want to mount a can on the barrel, you may just find that you will have to replace the can after one shot (as you have a new exit hole). :-(



C4

I usually run the Winchester or Lake City 5.56x45mm M855 SS109 ammunition. Never had a problem with it.

[C4IGrant]

I usually run the Winchester or Lake City 5.56x45mm M855 SS109 ammunition. Never had a problem with it.

You got a good one appears. The true test however is MK262.


C4

[AR15barrels]

Generally speaking, 1/9 twist barrels tend to have a 223 Wylde chamber and not a 556 NATO chamber. I am not saying that this applies to Sully's barrels, but that is what I (and my 556 NATO reamer) have found.

223 Wylde has more generous body dimensions than a 5.56 NATO.
It's mostly the throat and chamber length where they differ.
The throat is where the accuracy is.
The chamber length and body dimensions is where the reliability is.

[C4IGrant]

223 Wylde has more generous body dimensions than a 5.56 NATO.
It's mostly the throat and chamber length where they differ.
The throat is where the accuracy is.
The chamber length and body dimensions is where the reliability is.

Yes I am aware of this. It is really hard to say what chambers some of the "556 NATO" chambers actually are so the 223 wylde chamber is simply a guess. They could be .223 or who knows.


C4

[aloharover]

I thought ADS was on the list?

Also according to CMMG some of the items that are listed as options are standard.

Anyone?

[Jack_Stroker]

You got a good one appears. The true test however is MK262.


C4

I guess I am not familiar with that ammunition. I'm willing to give it a shot though. If my Bushmaster doesn't like it, my Colt should handle it fine.

[AR15barrels]

It is really hard to say what chambers some of the "556 NATO" chambers actually are so the 223 wylde chamber is simply a guess. They could be .223 or who knows.

Well...
I picked up a hotplate for the shop so I can start documenting chamber dimensions.
Within a few months, I should have more data.

[Robb Jensen]

Well...
I picked up a hotplate for the shop so I can start documenting chamber dimensions.
Within a few months, I should have more data.

I thought that was for your Jiffy Pop?

[vicious_cb]

Any thoughts to adding FN to the chart?I saw a used upper in the store today and I was wondering how it ranks with the other mfgs.