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"People have always been stupid. The Internet just makes it easier for us to know about them." - donlapalma
I stepped my 11.5" to a -2 from a -3 and ran 600 rounds of M193 through it with and without the suppressor. Ran like a top.
I've noticed that my Christmas Cheer barreled upper has somewhat weak ejection, but it's oddly at about 1:30. I don't put a lot of stock in ejection patterns, but I think it has something to do with the geometry of the MUR deflector. It's very smooth, without a single malfunction, so I'm not concerned. But it does make me wonder if the SR16 CQB barrel is ported differently (smaller). If so, that's a good thing. This is with an A5H2 buffer & M193. Ejection is similar with a -1 but snappier and throws the brass further.
Finally got an A5 on one of my SBRs and got to the range. KAC 11.5" SBR CQB upper. I used the A5H2 and H3 both suppressed and unsuppressed. Very smooth and it ran flawlessly. Just like my other A5 system. I didn't notice any difference between the A5H2 and H3 so I didn't take the H4 out of the package.
BTW, my CQB throws the brass out about 1:30 with both the A5H2 and H3, although with the H3 installed the brass dribbled out at about 1:30 but no problems. The upper throws the brass further with suppressor attached.
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I like the A5 in the KAC 14.5" and 11.5". The A5H3 proved to be too much of a good thing in winter though. They cycled without a can, but didn't catch the bolt stop about a third of the time. Both ran like a champ in the cold with the A5h2. Ironically, the supplied H2 carbine buffer was too much for the extended gas 14.5", but ran like a champ with the A5H2. 13.7" Noveske barrels ( no pig) do the same in the cold as the KAC 14.5". In the summer the difference between the feel of the A5H2 and A5H3 aren't much, so I leave the 2 in unless I knows the cans are staying on for the shoot, then they're A5H4s with Sprinco green to give it some zip back.
Overall, I think the A5 kit helps out reliability and smoothness. It doesn't cycle as snappy as the carbine system, so it may not be for everyone's taste.
Thanks. I had an SR15 that ejected similarly (1:30), but I never had any issues with it. The only thing I noticed that concerned me about the CQB was the force of ejection and not necessarily the direction. I still wonder if the port on the Christmas Cheer barrel is ported differently than the standard CQB uppers. Maybe a PM to Kevin is in order just to satisfy my curiosity.
I'm interested to hear the response. I didn't run the sr-16 upper suppressed but it appeared to throw the brass further (even .223) and about 3-4 o'clock. I suspect there is a difference in porting size.
The other benefit of the sr-16 barrel is the medium contour. You don't feel the heat as fast. After two magazines suppressed the sr-15 11.5" CQB LW profile gets pretty hot.
Just talked to Kevin. No difference in .mil vs commercial ports on the CQB barrels. Good news for everyone! And before anyone asks, I did not ask for the exact port size.
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