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Posted: 8/26/2016 10:09:38 PM EDT
I've always thought about doing an SPR with an 18" barrel but it was way down the list. Then I find out that I won a LaRue barrel and I chose an 18" Stealth.

Now that I have the barrel on the way I have no idea where to go with it. I've been thinking about 16" guns for so long I feel lost.

I have wanted a Mk12 but LaRue isn't a legit Mk12 barrel so I don't think I'll go for a Mk12 clone.

Those of you with 18" SPR's, can you post pics to get some ideas flowing? Please post parts list with it if possible.

Thanks!
Link Posted: 8/26/2016 10:17:47 PM EDT
[#1]
Quoted:
I've always thought about doing an SPR with an 18" barrel but it was way down the list. Then I find out that I won a LaRue barrel and I chose an 18" Stealth.

Now that I have the barrel on the way I have no idea where to go with it. I've been thinking about 16" guns for so long I feel lost.

I have wanted a Mk12 but LaRue isn't a legit Mk12 barrel so I don't think I'll go for a Mk12 clone.

Those of you with 18" SPR's, can you post pics to get some ideas flowing? Please post parts list with it if possible.

Thanks!
View Quote


Start flipping through the spr pic thread, lots of 18 inch rifles in there.
Link Posted: 8/26/2016 10:18:51 PM EDT
[#2]
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.





These are both 16",  but the 13" Geissele would be my choice on an 18" barrel as well.















But since you asked for an 18".







 
Link Posted: 8/26/2016 10:28:36 PM EDT
[#3]
He won an 18" barrel.  Those 16 inches won't help him and I've never got any of my 16" rifles to shoot as soft as my 18".

Personally, I think an 18" barrel with a kac urxiii are pore sex.
Link Posted: 8/26/2016 10:39:42 PM EDT
[#4]
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Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 
View Quote


It depends how far you are shooting... at 600 yards, it does make a difference.
Link Posted: 8/26/2016 10:50:44 PM EDT
[#5]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


It depends how far you are shooting... at 600 yards, it does make a difference.
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Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.
Link Posted: 8/26/2016 10:52:06 PM EDT
[#6]
URX III on an 18 does well

Link Posted: 8/26/2016 10:57:02 PM EDT
[#7]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.
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Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
Link Posted: 8/26/2016 11:04:43 PM EDT
[#8]
He won a Larue barrel.  He can pick any length he wants.  I won a Larue barrel as well and chose the 20in Stealth because I wanted rifle gas.  Larue does not use rifle gas on their 18in barrels.

Discussion ForumsJump to Quoted PostQuote History
Quoted:


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.
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Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.

Link Posted: 8/26/2016 11:12:20 PM EDT
[#9]
Below is an 18in SPR'ish build.  

Ballastic Advantage SPR Premium 18in barrel
Aero M4E1 upper
Aero 15in Quantum M-lok handguard
Spike Crusader lower
Larue grip
Magpul SL stock


Link Posted: 8/26/2016 11:40:28 PM EDT
[#10]

Discussion ForumsJump to Quoted PostQuote History
Quoted:
I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:



Quoted:


Quoted:


Quoted:

Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.





 




It depends how far you are shooting... at 600 yards, it does make a difference.





Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.




I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
So you can hear ~2/1000ths of a second difference at 600yds?



 
Link Posted: 8/26/2016 11:52:14 PM EDT
[#11]


Noveske N4 upper and lower
Noveske LPK
Giessele G2S
Luth-ar stock
18" intermediate gas LW barrel - noveske
AAC Blackout 2.0 mount
Odin works 15.5" Keymod
AIM BCG NiB
BCM mod 3 grip

Vortex viper pst MRAD 6-24x50 scope
Link Posted: 8/27/2016 12:02:33 AM EDT
[#12]






Bottom gun:


Older build, probably 8 years old or so.


Anvil Arms lower


EA stripped upper


CMMG SPR 1:8 barrel


Troy 13.5 inch rail


RRA National match 2 stage trigger.







Top gun: old Armalite that I have since sold


 
Link Posted: 8/27/2016 12:43:48 AM EDT
[#13]
Link Posted: 8/27/2016 1:00:32 AM EDT
[#14]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


It depends how far you are shooting... at 600 yards, it does make a difference.
View Quote View All Quotes
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Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Having just send a few hundred rounds of IMI Razor Core and CBC 77gr ammo out of both my 16" and 18" rifles on Thursday, with crosswinds, at 250y, 500y, 600y, 600m, and 750y steel...

No. And not based on the range trip before that, or even the numerous ones last year.

No more than a few 1/10s MIL in terms of dope, basically the same wind call. If you chart it out, the velocity difference isn't that significant. Yes, one may poke the plate a wee bit harder, but we're not talking about 5.56 vs .308 here. This is same round, same bullet, maybe 50 FPS difference in velocity. Both are still supersonic at 750, which is already far enough for a 5.56. Both are subsonic before 1000. Why choose the 18" barrel? A good 16" barrel with a 77gr or similar bullet as fast as possible makes for a great 0-600 gun, that can stretch out to ~800 as required. If you're really trying to get past that, why are you using a 5.56?

Link Posted: 8/27/2016 2:23:07 AM EDT
[#15]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Having just send a few hundred rounds of IMI Razor Core and CBC 77gr ammo out of both my 16" and 18" rifles on Thursday, with crosswinds, at 250y, 500y, 600y, 600m, and 750y steel...

No. And not based on the range trip before that, or even the numerous ones last year.

No more than a few 1/10s MIL in terms of dope, basically the same wind call. If you chart it out, the velocity difference isn't that significant. Yes, one may poke the plate a wee bit harder, but we're not talking about 5.56 vs .308 here. This is same round, same bullet, maybe 50 FPS difference in velocity. Both are still supersonic at 750, which is already far enough for a 5.56. Both are subsonic before 1000. Why choose the 18" barrel? A good 16" barrel with a 77gr or similar bullet as fast as possible makes for a great 0-600 gun, that can stretch out to ~800 as required. If you're really trying to get past that, why are you using a 5.56?

View Quote View All Quotes
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Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Having just send a few hundred rounds of IMI Razor Core and CBC 77gr ammo out of both my 16" and 18" rifles on Thursday, with crosswinds, at 250y, 500y, 600y, 600m, and 750y steel...

No. And not based on the range trip before that, or even the numerous ones last year.

No more than a few 1/10s MIL in terms of dope, basically the same wind call. If you chart it out, the velocity difference isn't that significant. Yes, one may poke the plate a wee bit harder, but we're not talking about 5.56 vs .308 here. This is same round, same bullet, maybe 50 FPS difference in velocity. Both are still supersonic at 750, which is already far enough for a 5.56. Both are subsonic before 1000. Why choose the 18" barrel? A good 16" barrel with a 77gr or similar bullet as fast as possible makes for a great 0-600 gun, that can stretch out to ~800 as required. If you're really trying to get past that, why are you using a 5.56?



Not trying to hijack. But the challenge on 5.56 at 800 plus is fun and a good skill builder.
Link Posted: 8/27/2016 2:24:45 AM EDT
[#16]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
So you can hear ~2/1000ths of a second difference at 600yds?
 
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Quoted:
Quoted:
Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
So you can hear ~2/1000ths of a second difference at 600yds?
 


Link Posted: 8/27/2016 7:32:09 AM EDT
[#17]
Didn't mean for this to become a 18" vs 16". The decision has been made an I have an 18" barrel on the way. I'm just looking for some pics for inspiration.

Thanks to those that have contributed. I really love the PRI handguard look but still want to avoid going towards a Mk12 clone.
Link Posted: 8/27/2016 7:40:22 AM EDT
[#18]
You could stick a 14.5" URX4 on there:

Link Posted: 8/27/2016 8:32:51 AM EDT
[#19]
Link Posted: 8/27/2016 2:09:08 PM EDT
[#20]
Here's mine.
LaRue: 18" stealth, gas block, MBT, grip, RAT stock(UDE), scope mount.
Spikes: receiver set
Fortis: Switch rail
Leupold: VX-R Patrol 3-9x40
BCM: charging handle
Aim Surplus: V2 nitride bcg.

</a>" />

</a>" />

</a>" />
Link Posted: 8/27/2016 2:39:12 PM EDT
[#21]
Link Posted: 8/27/2016 2:45:42 PM EDT
[#22]
Get both



Top is 18" bottom is 16"




Link Posted: 8/27/2016 2:56:33 PM EDT
[#23]
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Link Posted: 8/27/2016 3:31:40 PM EDT
[#24]
Link Posted: 8/27/2016 4:13:07 PM EDT
[#25]
Still working on mine, not a clone, just a rifle for fun.  SPR-ish?
DPMS lower and parts



Timney Trigger



PRS and MIAD



Aero Precision upper, BCG, 18" .223 Wylde stainless barrel, and 15" M-LOK handguard
Haven't decided on optics yet.  May stick a TA-01 on a TA-51 mount and use it until I decide on something else.


 
 
Link Posted: 8/27/2016 4:51:30 PM EDT
[#26]



Discussion ForumsJump to Quoted PostQuote History
Quoted:




Here's mine.



LaRue: 18" stealth, gas block, MBT, grip, RAT stock(UDE), scope mount.



Spikes: receiver set



Fortis: Switch rail



Leupold: VX-R Patrol 3-9x40



BCM: charging handle



Aim Surplus: V2 nitride bcg.
http://<a href=http://i633.photobucket.com/albums/uu60/dbryce/043.jpg</a>" />
http://<a href=http://i633.photobucket.com/albums/uu60/dbryce/029.jpg</a>" />
http://<a href=http://i633.photobucket.com/albums/uu60/dbryce/040.jpg</a>" />
View Quote
That thing would be killer with a fixed stock.





Forgive the 20" in the back.









 
 
Link Posted: 8/27/2016 6:19:10 PM EDT
[#27]
Here is what I did with the 18" Stealth barrel I won back at Christmas. (9 lbs 5.3 ozs. as you see it with the empty 30-round magazine)

Link Posted: 8/28/2016 2:37:54 AM EDT
[#28]
There is some hotness in this thread!
Link Posted: 8/28/2016 7:52:14 AM EDT
[#29]
Link Posted: 8/28/2016 10:01:54 AM EDT
[#30]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
yeah, not mine though
View Quote


No, it's hot, and I bet it's light with the Aero mount, 'tar barrel, and that freefloat handguard.

I've been on a lightweight kick and lightweight is sexy. I went with the stealth barrel to mix it up and get some weight in my life.

I'm thinking maybe...a UBR stock?

For some reason I don't want to go with the basic forged receiver and maybe try something special. I'm not thinking Battle Arms or 2A lightweights, but something different for me...maybe SMOS?
Link Posted: 8/28/2016 10:14:56 AM EDT
[#31]
Link Posted: 8/28/2016 10:28:45 PM EDT
[#32]
Discussion ForumsJump to Quoted PostQuote History
Quoted:

  The UBR is a great choice, the next 18" I have on the table for a build will have a 18" PredatAR barrel and a UBR.
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Quoted:
yeah, not mine though


No, it's hot, and I bet it's light with the Aero mount, 'tar barrel, and that freefloat handguard.

I've been on a lightweight kick and lightweight is sexy. I went with the stealth barrel to mix it up and get some weight in my life.

I'm thinking maybe...a UBR stock?

For some reason I don't want to go with the basic forged receiver and maybe try something special. I'm not thinking Battle Arms or 2A lightweights, but something different for me...maybe SMOS?

  The UBR is a great choice, the next 18" I have on the table for a build will have a 18" PredatAR barrel and a UBR.


Good to know.

Any more contributions?
Link Posted: 8/29/2016 12:31:13 AM EDT
[#33]
I won a barrel on 8/18 and can't decide which 18' i want.
I've got a lower build kit with an ACS-L stock already, and a aero lower
Will likely grab a Aero enhanced upper with either quantum or enhanced 15' mlok rail
Cant decide if I"m better served with an 18 Tar or 18' stealth and the extra 13 oz
Link Posted: 8/29/2016 1:14:55 AM EDT
[#34]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I won a barrel on 8/18 and can't decide which 18' i want.
I've got a lower build kit with an ACS-L stock already, and a aero lower
Will likely grab a Aero enhanced upper with either quantum or enhanced 15' mlok rail
Cant decide if I"m better served with an 18 Tar or 18' stealth and the extra 13 oz
View Quote


I bought a 16" 'tar last year and I've been on a lightweight kick. I went Stealth because I wanted to have something heavy in my closet that I can sit on a bench or prone with. Just wanted to change it up a bit.

Part of me also wishes I went 12" as a motivation to finally SBR a lower but oh well.
Link Posted: 8/29/2016 10:21:45 AM EDT
[#35]


18" Larue Stealth barrel



Larue MBT & APEG grip



Aero Precision M4E1 upper w/ 15" Quantum M-Lok handguard



Aero Gen2 stripped lower



Luth-AR MBA-1 stock

VG6 Precision Gamma 5.56 brake w/ CAGE device















 
Link Posted: 8/29/2016 10:28:10 AM EDT
[#36]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
URX III on an 18 does well

<a href="http://s277.photobucket.com/user/johndsphoto/media/Mobile%20Uploads/MK12MOD1URXIII_zps840cbc5d.jpg.html" target="_blank">http://i277.photobucket.com/albums/kk44/johndsphoto/Mobile%20Uploads/MK12MOD1URXIII_zps840cbc5d.jpg</a>
View Quote

now that is a bad bitch.
Link Posted: 8/29/2016 10:48:15 AM EDT
[#37]
-ish I guess

Link Posted: 8/29/2016 11:53:57 AM EDT
[#38]
here is mine:
LaRue Stealth 18"


Midwest Industries MLOK 15" rail


Armalite lower of some sort... "extra" I had


LaRue MBT Trigger (love it)


Nikon M-223 3-12X scope (BDC reticle...meh).


Harris Bipod


YHM muzzle brake for suppressor.







I've taken out to 300Y and done OK with it, using primarily Mk262 or similar (IMI razorcore, CBC).  I don't like the BDC reticle that much though.  Out to 200 it is like a laser but at 300 the "OK" is due to the shooter not the weapon.






















 

 
Link Posted: 8/29/2016 2:18:54 PM EDT
[#39]
I also won an 18 inch predator barrel OP and find this thread very helpful. I can't decide between KMR 15 or Geissele SMR 15.

Here's a KMR 15 on an 18 incher from BCM's website.

Link Posted: 8/29/2016 2:57:43 PM EDT
[#40]
18" Wilson 223 Wylde 1/8 W/SLR Solo free float and SLR adjustable Gas block (Steel) North Tech Lower Cross Machine Tools Upper (Massachusettes Legal)


Link Posted: 8/29/2016 10:02:43 PM EDT
[#41]
My humble budget 18" SPR-ish addition

Link Posted: 8/29/2016 10:19:39 PM EDT
[#42]
Noveske 18" SPR barrel . . .














.....
Link Posted: 8/29/2016 10:24:50 PM EDT
[#43]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.


I don't know about that, but I notice the difference in drop beyond 300 meters.  Just makes it easier to match the BDC on reticles.
Link Posted: 8/29/2016 10:49:49 PM EDT
[#44]
Ha, I won a free barrel from Larue, too! To date it has cost me over $700!

I chose the 18" Predatar barrel with a lightweight spr build in mind. PSA lower with ACS-L stock, 15" BCM KMR alpha rail. Hoping to put a vortex 2-10x on it someday.
Link Posted: 8/30/2016 12:00:19 AM EDT
[#45]



CLE Intermediate gas nitride barrel with .625 gas block
Noveske gen1 forged lower with Geissele
BCM Mod4 CH
URX3.1 13.5
B5 SOPMOD
KAC Taupe pistol grip and URX3 panels
Vortex Razor 3-15x42 HSR-4 in 2" cantilever mount

Quoted:
Ha, I won a free barrel from Larue, too! To date it has cost me over $700!

I chose the 18" Predatar barrel with a lightweight spr build in mind. PSA lower with ACS-L stock, 15" BCM KMR alpha rail. Hoping to put a vortex 2-10x on it someday.
View Quote


If you're looking at the Razor HD-LH 2-10x40, you're making the right decision.  That optic is incredible.
Link Posted: 8/31/2016 2:36:48 PM EDT
[#46]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.


I've had them side by side with 77 grain ammo. You can tell the difference as far as how long it takes to hear the "ding", how much the steel plate moves, how loud, and wind impact.


The data is out there for all to see. Hint, it's insignificant between a 16" and 18" barrel. IIRC it's around 50 fps. You can keep you 2 inches.

Link Posted: 8/31/2016 2:40:42 PM EDT
[#47]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Didn't mean for this to become a 18" vs 16". The decision has been made an I have an 18" barrel on the way. I'm just looking for some pics for inspiration.

Thanks to those that have contributed. I really love the PRI handguard look but still want to avoid going towards a Mk12 clone.
View Quote


Its expensive and doesn't do anything the modern handguards don't. If it wasn't for the .mil using them briefly there would be no interest in them

Check out the BCM KMR rails. I have the 13" on my 16"  and its awesome.

If would have went with an 18" barrel I would have got the KMR 15" rail.
Link Posted: 8/31/2016 5:26:43 PM EDT
[#48]
Faxon 18" rifle length gas
UTG Pro 17" Rail

Link Posted: 8/31/2016 5:42:23 PM EDT
[#49]
Link Posted: 8/31/2016 7:13:45 PM EDT
[#50]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Unless you're building a clone, 18" doesn't do much that a 16" wouldn't handle.


 


It depends how far you are shooting... at 600 yards, it does make a difference.


Not much with the better bullets you can get today that will meet those velocities out of a 16" barrel.  The biggest advantage of the 18 has always been its rifle length gas system.  Go look and see what 3 gunners use. In reality 2 inches won't slow you down, 18 inches is still short for anyone that's spent some time behind a bolt gun.



And now even that isn't absolutely necessary.  My most recent 3Gun build uses a 16" MicroMOA barrel with rifle length gas system.  It's ridiculously soft shooting.
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