If it cycles a bit faster than a different barrel it’s more likely to drop a primer.
If it cycles a bit faster than a different barrel it’s more likely to drop a primer.
What was the cyclic rate before and after the barrel change?
"An opinion solicited does not equal one freely voiced," Al Swearengen, Deadwood 1877.
I have no evidence of this, but I have the feeling the 11.5 thing came about because BCM is a manufacturer and makes a lot of rifles, and as a manufacturer they have to warranty repair and diagnose rifles that people complain aren't working right or aren't working at all. With all of the people out there that they sell to, some will use underpowered steel 223 while others use nice hot 556. if they open up the port on a 10.x barrel then the 223 cycles fine but the 556 kicks harder and wears out parts faster. if the keep the port optimized for brass 556 suppressed, then 223 won't cycle. it's harder to please both parties with one barrel port size.
the "dwell time" is the time the bullet is past the port and keeps pressure "on" before the bullet exists and releases the pressure. with a 11.5, there's a longer period after the bullet passes the gas port than on a 10.x barrel. that opens up forgiveness and allows manufacturers to see less complaints about their barrels from both the 223 steel crowd and the 556 suppressed crowd.
i really like what clint and brt are doing in that they are giving users the option to tailor the gas tube port size to the type of ammo and system the end user shoots.
Clinster, that was a solid post, good on you. I have both 10.3's, 10.5's and 11.5's that run well and I have often wondered what the bottom line on the 10.3 10.5 vs 11.5 story was all about. Good explanation. It's one reason I run suppressed 100% of the time.
Euro, it takes the AR10 gas guns too.
PB
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What kind of math formula did Paul Bafoni use to determine a 11.5 is 4% longer than a 10.5?
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