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Rifles, Reloading, Optics, Equipment
Reloading
MK 318 ammo Info 5.56
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<blockquote data-quote="Bastard TwoTwo" data-source="post: 859439" data-attributes="member: 71841"><p>Yeah, that's a part of it- for instance, the SOPMOD Mk18 MOD 0 was developed by Crane Division (Navy) for use by Special Ops units throughout the military (they don't just cater to SEALs is what I'm getting at). It's supposed to kinda bridge the gap between the M4/SOPMOD Mk1 and the M14/Mk14 DMR. It's basically an M4 with an AR15 upper- the barrel is 16". It was found during development by Crane that in the 16" barrel, a 1/10 twist is what they consider optimal balance between mid-distance accuracy (~500m) and terminal effect (i.e., the probability of tumble, bounce, etc.).</p><p> </p><p>I also do know that the 1/7 twist rate of the XM16/M16/M16A1 was dropped sometime ago (in the '90's?) in favor of a 1/9. I did use an M61A2, which had been re-barreled at least once I should add, that had a 1/9 (it was engraved right on the barrel). What I don't know is whether that was the original twist rate of the M16A2, or if that barrel was added later as an upgrade, which the military does quite often, since it's cheaper than buying a whole new weapon system. I am quite positive that the 'A3 had a 1/9, and I know that the 'A4 I qualified with at Benning was a 1/9. </p><p> </p><p>This is all, of course, presuming I haven't lost my marbles. These things happen. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /></p></blockquote><p></p>
[QUOTE="Bastard TwoTwo, post: 859439, member: 71841"] Yeah, that's a part of it- for instance, the SOPMOD Mk18 MOD 0 was developed by Crane Division (Navy) for use by Special Ops units throughout the military (they don't just cater to SEALs is what I'm getting at). It's supposed to kinda bridge the gap between the M4/SOPMOD Mk1 and the M14/Mk14 DMR. It's basically an M4 with an AR15 upper- the barrel is 16". It was found during development by Crane that in the 16" barrel, a 1/10 twist is what they consider optimal balance between mid-distance accuracy (~500m) and terminal effect (i.e., the probability of tumble, bounce, etc.). I also do know that the 1/7 twist rate of the XM16/M16/M16A1 was dropped sometime ago (in the '90's?) in favor of a 1/9. I did use an M61A2, which had been re-barreled at least once I should add, that had a 1/9 (it was engraved right on the barrel). What I don't know is whether that was the original twist rate of the M16A2, or if that barrel was added later as an upgrade, which the military does quite often, since it's cheaper than buying a whole new weapon system. I am quite positive that the 'A3 had a 1/9, and I know that the 'A4 I qualified with at Benning was a 1/9. This is all, of course, presuming I haven't lost my marbles. These things happen. :rolleyes: [/QUOTE]
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MK 318 ammo Info 5.56
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