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Posted: 1/18/2015 3:49:45 PM EDT
[#1]
Typically an 18"+ barrel is used to be considered an SPR. The reason being is you'll get more fps out of that barrel for reaching out to farther distances. An 18-inch (457 mm) threaded-muzzle match-grade free floating stainless steel heavy barrel with a 1:7 (178 mm) rifling twist ratio is standard for the SPR.These barrels were designed to take advantage of the new Mk 262 cartridge, which uses a 77-grain bullet.
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Posted: 1/18/2015 4:27:52 PM EDT
[#2]
The benefit is the gas system. My SPR these days is 16".
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Posted: 1/18/2015 5:25:17 PM EDT
[#3]
What is the difference I'll see staying with a 16"?
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Posted: 1/19/2015 12:12:28 AM EDT
[#4]
Quote HistoryQuoted:
What is the difference I'll see staying with a 16"? Lighter, more maneuverable, that's about it. In .223/5.56x45 the increase in barrel length is to give the projectile more velocity out of the muzzle for greater effective range and terminal performance. An 18" barrel is more of a technical compromise between the full 20" and carbine 16" lengths. It's easier to maneuver than a 20", but still gives the bullets a more 'oomph' than a 14.5 or 16". |
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Posted: 1/19/2015 12:39:05 AM EDT
[#5]
Unless you are going out past 300 yards, you'll never see a difference. So how far are you planning on shooting???
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Posted: 1/19/2015 12:48:40 AM EDT
[#6]
Give this a read:
http://www.sadefensejournal.com/wp/?p=1093 |
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Posted: 1/19/2015 2:20:11 PM EDT
[#7]
Here's a recent thread with good info about barrel length, accuracy, velocity etc
http://www.ar15.com/forums/t_3_118/666018_Is_it_worth_spending_the_money_for_a_20_barrel_.html |
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