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I seriously must be lucky. I bought H2 and h3 and A5's and have 11.5's and 12.5's and 16 inch guns. I never had an issue swopping them around causing FTF or anything. I swop the upper and lowers around without regard, and never had issues.
I even ran my 11.5 on my A2 Colt lower. Ran like a champ.
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
True, however...
When I did my article about the pre-production prototype SR15 Trey told me very specifically not to even bother trying to run Wolf or other similar ammo in it and to only shoot ammo like XM193. Fast forward a few years to production guns and there were more than a few people that sent their guns back to have the gas port opened up further because of reliability problems, to the point that the production gas port size was changed to a larger one.
Which I think is part of the point some of the other posters are making. If you're a rabid three-gun competitor and can actually take advantage of the difference (hint, you should already be the guy to beat at your local matches for this to matter) and are willing to shoot one kind of ammo and one kind only, and keep a handle on the level of cleanliness of the gun, trying to run on the ragged edge of reliability in order to achieve "smoother" may be worthwhile. For everyone else it's the kind of minutiae that tends to distract from what matters.
what year did they start to open the gas ports.
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
I'm not sure. There are several posts about it on the KAC section of Silencertalk from Kevin B, Trey, and Casey (I think).
ETA:
My article appears in the January 2009 SWAT
Last edited by rob_s; 03-23-12 at 19:21.
I am not a huge steel cased guy. I run it in my piston gun and that's about it.
I did try it for 40 rounds in my SR15. So I don't exactly have much experience with it there. But it did run what I put through it. That being said, with full power 5.56 and a BattleComp it felt like a .22lr. Literally.
I think there are gains to be made, as far as other manufacturers go. But what do I know. I'm just a user. Not a smith / engineer.
I've seen people say you get a harder recoil impulse with piston set ups... when i use one of my piston rigs I cant tell a big difference between them & my KAC rig. A lot of people say piston guns are a answer looking for a problem, while I can agree with that somewhat, I think Larry Vickers said it best when he said "there is a time and place for a piston AR". Short barrels, full auto, different ammo, suppressed use for instance".
Full auto for example. I can tell a difference between running a D.I. rig vs Piston rig as far as how fast it heats up... They both get hot, but D.I.s on full auto get hotter faster 4 sure.
Other than those examples though, I really cant see much of a advantage with piston systems over D.I.s, I've had D.I. rigs since i was young, Never have had a real problem with them as long as they were from a good reputable manufacture. D.I.s on the other hand do have some advantages over the Piston system also.
I don't think people that buy piston system ARs should be bashed for their preference... I mean if they think they are going to be in some pond or lake somewhere playing navy seal... more power to'em. At least they would have an somewhat advantage there. Wouldn't have to worry about the gas tube filling up with water.Some people just get them to add to their "arsenal". Long as its a good rig from a reputable manufacture, So what.
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Back from the dead.
Hey all. after consulting with another AR enthusiast, he seems to think that adding a sprinco extra power spring might give the carrier enough forward energy to feed that round. As I have not been experiencing any issues with FTE, bolt override or other short stroking issues, I think this might be the ticket. However we have discussed that there is a chance of this being induced by the spring. Anyone care to comment/help with this can of worms I'm opening?
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