Quote:
Originally Posted by tinmanHRSO
I think my post is being taken out of context for one thing I stated, and then ignored for the point I was trying to make. I was asked about it's possibility to produce MOA performance, which it does. I never said the Krink would equal a 16" velocity. I said "Near" I only mentioned the back pressure of the Krink to explain why the 10" barrel which is famous for being problematic, is so reliable with Noveske systems, along with it's polygonal rifling. If I hadn't mentioned that, I'm sure someone would have commented quickly about SBRs inherant unreliability. When using the 62gr SS109 from a standard 16" barrel velocity is approx 2989fps. The 10" standard barel is approx 2627fps. A difference of just 327fps. If the Krink and polygonal rifling used together create a back pressure sufficient enough to raise velocity by just 100fps, wouldnt you consider that to be "NEAR" 16" barrel velocity??? After all, you must remember, it does function flawlessly, cycling the bolt on a system designed for 16 - 20" barrels, using ammunition designed for 16 - 20" barrels without gas problems which are associated to SBRs and low velocity.
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I agreed with you on the accuracy issue, but do not buy into the Krink hype.
I have a LMT 10.5" SBR that runs flawlessly. As you can read elsewhere here, I took it to a tactical carbine course and put over 1,000 rounds per day through it for several days with no upper problems, including several hundred rounds per day with a SureFire FA556K can mounted. I have fired bullet weights from around 40 grains up to 77 grains through it and the function of the upper has been flawless.
The problem is that too many companies (and individuals) think that all you have to do to create a shorty is to cut the barrel down, and many do not shoot it enough to find out that they will not run.
I have spoken extensively with firearms designers and engineers, and the cycle on the AR-15/M-16 weapons requires not just gas pressure (which can be increased by overboring the gas port), but dwell time, gas tube volume and length, bolt weight, extractor tension, chamber dimensions and finish, buffer spring strength, buffer weight, ammo, etc.
Good manufacturers take the time to sort all of that out and build a package that will run properly under a variety of conditions. Others will just slap it together and if a rifle is returned, slap a Band-Aid on it and send it back.
I have logged a lot of time over a Chrony shooting suppressed and unsuppressed ARs, and I do not think that you are getting 100 fps from increased backpressure from the barrel and Krink.
TR