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1/22/2020 12:12:56 PM
Posted: 1/18/2015 2:08:18 PM EST
Building an SPRish type AR next. Any reason to step up to 18"? Is there really that much benefit?
Link Posted: 1/18/2015 2:49:45 PM EST
[Last Edit: 1/18/2015 2:50:13 PM EST by DSTRBD_ONE]
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.
Link Posted: 1/18/2015 3:27:52 PM EST
The benefit is the gas system. My SPR these days is 16".
Link Posted: 1/18/2015 4:25:17 PM EST
What is the difference I'll see staying with a 16"?
Link Posted: 1/18/2015 11:12:28 PM EST
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Originally Posted By bantis:
What is the difference I'll see staying with a 16"?
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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".
Link Posted: 1/18/2015 11:39:05 PM EST
Unless you are going out past 300 yards, you'll never see a difference. So how far are you planning on shooting???
Link Posted: 1/18/2015 11:48:40 PM EST
Give this a read:

http://www.sadefensejournal.com/wp/?p=1093
Link Posted: 1/19/2015 1:20:11 PM EST
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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