Posted: 8/23/2020 2:33:13 PM EDT
| What's the dope on the M82a1 20 inch barrel vs the 29? Is there a compelling reason (ballistics, range, etc) to not go with the 13318 (20 inch) and go with another 29 inch model for another $900 plus? |
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Originally Posted By akethan: 20 is lighter and more mobile. 29 is better for long distance. How far will you be shooting it? With the ranges around here I'm guessing it would be a max around 457 meters. When you say "long distance", what's the drop off for 20 vs 29? I'm pretty sure I won't be shooting any VBIED's so terminal performance isn't an issue.  . I'm just curious.
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| Haven’t handled a 20” so limited perspective but the rifle is a pig anyway you cut it. Even lopping 9” off the barrel I don’t see it becoming appreciably more svelte. Might as well get the 29” and wring all the FPS out of the round. Plus, I think the standard barrel length looks visually balanced |
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I went with the short barrel on a M107a1 because I wanted to run a QDL and the overall length with the can on the 29” barrel seemed ridiculous. The decision was easy after someone pointed out a ~2012 video from Shot Show with Ronnie Barrett saying that even though you lose a couple hundred feet/second in velocity the short barrel shows better accuracy vs the long. Skip ahead to ~27:00. https://youtu.be/I82rCtAe0nc?si=njFpR3ivcal1dlZT By the way, the QDL completely changes the muzzle blast and recoil of the rifle. There is no felt muzzle blast pressure by the shooter and observers standing to the sides and behind the shooter. The recoil is turned into a slower shove, similar to a 20ga with light loads. Amazing difference. Without the can it’s a full rodeo of muzzle blast pressure and mule kick. 
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