Do you have any suggestions for a buffer/spring combination for the 16" sr15? As mentioned in the thread, I would like to have a setup was that would able to reliably cycle 5.56 ammo suppressed and unsuppressed.
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Do you have any suggestions for a buffer/spring combination for the 16" sr15? As mentioned in the thread, I would like to have a setup was that would able to reliably cycle 5.56 ammo suppressed and unsuppressed.
BufordTJustice,
The newer KAC rifles come with a new style block that is double pinned instead of pressed on like they used to; I'm pretty sure I can get it off but the question is why would I want to remove the gas block?
I started researching the A5 system and came across this thread on m4c where a member was having issues with it on their kac. See below
https://www.m4carbine.net/showthread.php?t=75665
10-4 - I would love to use a switch-block from Noveske but it's too large to fit under the URX2. As long as I can iron out my carbine so it's 100% suppressed I'm happy.
Although I would love to see KAC make a switch block that fits under their URX series rails; I wouldn't be wading through this mess right now if they did. Frankly, I'm not impressed that my 11.5" upper is so over-gassed when run suppressed and wonder why the compromise from KAC on the gas port size.
it may be worth trying, a new/different ejector spring in your bolt. I know you diagnosed over gasing, but a stronger/faster spring might get that brass out of there a bit quicker. just a cheap idea.
however unlikely it is where i would start diagnosing the problem first. I do not know how far away from Newnan Ga you are but the ar bunker may have some in stock.
I doubt they are bad on both rifles but your suggestion does make sense. I'm sure KAC uses a decent quality ejector spring and I don't think anyone makes a stronger one.
(I have a few Colt ejector spring spares new in bag that I can access if I need them)
I'll try the H3 this coming week and see where I'll go from there. I will report back once the H3 is in the gun...
KAC has been contacted and is looking into the matter further. Guns should not be choking this hard when run suppressed... Will update thread as things progress.
I had the exact same problem (over gassed when running a can) on 2 different KAC SR15s one factory SBR one standard 16". I tried switching out the factory buffers with H2 and H3 but still had issues. I ran both uppers supressed on a stock Colt 6933 lower with H3 buffer and they ran 100%. This lead me to the theory that the factory KAC buffer spring must be a "light" spring. I switched the KAC factoy springs in both lowers to new standard carbine replacement springs (had them in my spares kit) and changed to H3 buffers. Both work 100% suppressed and unsupressed.