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Well, I shoot regularly with guys that run both 10.3" & 11.5" SBR's using the ST-T2's.
Both run great.....so unless my eyes are lying to me, I have some basis to believe it's worth a shot.
Both those guns, and my MK18 will be running blue Sprinco Springs, so maybe that's the variable the keeps those guns running with a buffer less than an H3.
And if I decide to dump it....I dump it. It's a 30 second swap.....I'm not seeing a lot of risk here.
Last edited by 5POINT56; 05-23-13 at 02:08.
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I suppose this is in the vein of this thread, but I have sort of an odd combo I will be testing out this weekend from a few left over parts. The configuration will consist of:
14.5 barrel with PWS comp
stock M4 FSB
fat boy carbine gas tube
stock buffer spring
H2 buffer
full auto BCG
Now to me the x-factor piece here is the gas tube, which I have zero experience with and understand that they are generally designed to work with adjustable gas blocks. I will be shooting 5.56 55gr Federal and am a tad concerned about the setup as far as the cycling goes. The fatty tube is already installed, so I thought I might as well experiment with it, but I have packed a few extra parts to swap on the fly if I run into issues (a stock carbine gas tube, an H buffer and a ST-T2).
You guys have any thoughts as to which setup might run best? First post so go easy on me lol
PS. the ST-T2 came with the used parts![]()
Welcome, the_0perator. Who made the barrel? Colt has defined the gas port size for a 14.5" carbine per TDP, so we could probably tell if your barrel is overgassed by the manufacturer.
Back to the original question, I prefer a lighter spring (Sprinco white or Brownells CS) and heavier buffer (at least H) for carbine REs. It's much preferred over a heavy spring and light buffer - reduced cyclic rate (less bolt stress, more reliable magazine spring function), less bolt bounce, and less sensitive to spring wear.
Having said that, all I use and recommend now is the A5.
Hey Bruin,
Thanks for the welcome. It is indeed a Colt upper(keyhole)/barrel(C MP 1/7). As I said, the upper came assembled with this fat boy tube installed, and with heavier buffer/BCG, I'm afraid the fat boy is only going to complicate things.
As far as buffer springs, I guess the good news is I am here in Austin, so maybe I can just run over to Sprinco and pick up one of those if that is whats needed to set this thing up properly.
First day on the forum and already going to send MarkM into the red, another post mentioning both a Spikes buffer and Sprinco springs.
None the less, I appreciate the help/info Bruin.
I don't know what effect (if any) the fat gas tube has, but I'd replace it with a normal one. There are better ways to achieve its advertised benefits.
You should be fine with an H2, and if you're only shooting 5.56 I'd try an H3. A Sprinco white/blue should work fine; Brownells CS carbine action spring is a cheaper alternative that's only a few bucks. Those will probably last a lifetime (just keep them lubed to ward off rust). If you stay with the stock spring, it's a good idea to replace it every 5k rounds.
If the upgrade bug ever bites, look into the Vltor A5 and LMT Enhanced carrier. With your PWS comp, this combo is pretty much as good as it gets for smooth shooting from your Colt upper.
Last edited by bruin; 05-23-13 at 17:01.
None of this is accurate. The reason Spike's uses tungsten powder is because they were attempting to imitate H&K... H&K buffers are filled with tungsten powder.
The part that Spike's got wrong is that those H&K buffers were designed for a completely different type of operating system, so they don't yield the same kind of results.
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