06-15-2018, 06:19 PM
KSW, excellent points, all.
1. One has to balance innovation vs. parts commonality vs. installed base. LWRC knows this from selling their proprietary lower receiver with an enlarged magazine well to fit larger Magpul 6.8 SPC polymer magazines. An improvement, yes. Wildly popular with the masses? Debatable. CMMG, as you mentioned, is also an excellent example. An improvement? Yes. Perhaps straying a bit too far from interchangeability? Probably.
2. My Mk125 bolt design uses standard barrel extensions and thus is completely interchangeable for all barrels headspaced for it.
3. Excellent point about "Why not improve the barrel extension while you're at it?" Good point that AR barrels are always sold with an extension, and if the 65G bolts are already a unique animal, why not mate them to a unique extension? Working on it! We might call this "Phase 2" of this particular product improvement project.
4. As LRRPF52 and others have pointed out many times, there is no SAAMI standard for boltface depth. Getting Grendel standardized via SAAMI and the market somewhat stabilized in the infancy of the cartridge has been achieved. I'm not gonna deviate from SAAMI spec, meaning chambers. I guess I already deviate in rifling, cuz SAAMI spec is six-groove and I do 5R.
What is to be gained — at this point — by "standardizing" on 0.136? Bolts and barrels are readily available for either 0.136 or 0.125. Today, if one goes 0.125 one knowingly is gambling on extractor strength. Until now. My extractor hook, for example, has 37% more metal in it than even a standard 5.56 hook.
5. We would not advocate this bolt as allowing the handloader insane new velocities, but, rather — as you mentioned — more "for safety purposes than performance gains."
1. One has to balance innovation vs. parts commonality vs. installed base. LWRC knows this from selling their proprietary lower receiver with an enlarged magazine well to fit larger Magpul 6.8 SPC polymer magazines. An improvement, yes. Wildly popular with the masses? Debatable. CMMG, as you mentioned, is also an excellent example. An improvement? Yes. Perhaps straying a bit too far from interchangeability? Probably.
2. My Mk125 bolt design uses standard barrel extensions and thus is completely interchangeable for all barrels headspaced for it.
3. Excellent point about "Why not improve the barrel extension while you're at it?" Good point that AR barrels are always sold with an extension, and if the 65G bolts are already a unique animal, why not mate them to a unique extension? Working on it! We might call this "Phase 2" of this particular product improvement project.
4. As LRRPF52 and others have pointed out many times, there is no SAAMI standard for boltface depth. Getting Grendel standardized via SAAMI and the market somewhat stabilized in the infancy of the cartridge has been achieved. I'm not gonna deviate from SAAMI spec, meaning chambers. I guess I already deviate in rifling, cuz SAAMI spec is six-groove and I do 5R.
What is to be gained — at this point — by "standardizing" on 0.136? Bolts and barrels are readily available for either 0.136 or 0.125. Today, if one goes 0.125 one knowingly is gambling on extractor strength. Until now. My extractor hook, for example, has 37% more metal in it than even a standard 5.56 hook.
5. We would not advocate this bolt as allowing the handloader insane new velocities, but, rather — as you mentioned — more "for safety purposes than performance gains."
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