brotherhef Posted April 13, 2011 Share Posted April 13, 2011 So far I have jp 15 lower stag upper (going to jp15 upper eventually) jp trigger ergo grip magpul ctr stock troy trx extreme benny hill rolling thunder (havent ordered yet cause they are out) milspec bcg (have jp lmos on order) jp gas block I have got some opinions from another forum, but wanted a few more for the barrel. I have done lots of research. I know I want 18" ss 1-8 twist. Im trying to decide if Id rather have the extra weight of a woa 18" vs a nordic 16" middy with little more recoil, but lighter weight. I have looked at jp (which are front a little front heavy),...which I did notice that the woa 18" "light contour" spr is only one once lighter than the dpms mk 12 18" heavy contour...kinda weird. any final thoughts would be much appreciated. Link to comment Share on other sites More sharing options...
Religious Shooter Posted April 14, 2011 Share Posted April 14, 2011 Did you get the JP gas block already? If you already have it (and you are married to it) it may determine what kind of barrel you will need to get. For example, the 16" mid-gas from Nordic that you noted... It requires a .75" gas block and it is midgas. If your handguard is rifle length+ the gas block will be under the handguard. So unless you have a minimized JP gas block and it's .75", it won't work (without major modification to it) with the Nordic barrel. The weight and length of a barrel is a personal taste thing. Unfortunately the only way to really determine what's good for you is to extensively use the different types of barrel. Link to comment Share on other sites More sharing options...
OPENB Posted April 14, 2011 Share Posted April 14, 2011 Most would suggest you go with rifle length gas in whatever barrel you choose. The recoil impulse is much softer. If you have to make one rifle do several jobs, the 16" midlength gas is a great compromise. My competition rifle has an 18" WOA with rifle gas from Ranier Arms. It is 1-7 twist. Very happy with it. I sent it to ADCO and turned down to M4 profile under the handguard. I was wanting the DPMS Mk 12 you mention, but at the time the wait was over a year. They are easily gotten now, Midway had them in stock last I looked, and the price is unbeatable. Just do not get a carbine gas barrel unless you have to. Just not a wise choice for a game gun. Link to comment Share on other sites More sharing options...
brotherhef Posted April 14, 2011 Author Share Posted April 14, 2011 Did you get the JP gas block already? If you already have it (and you are married to it) it may determine what kind of barrel you will need to get. For example, the 16" mid-gas from Nordic that you noted... It requires a .75" gas block and it is midgas. If your handguard is rifle length+ the gas block will be under the handguard. So unless you have a minimized JP gas block and it's .75", it won't work (without major modification to it) with the Nordic barrel. The weight and length of a barrel is a personal taste thing. Unfortunately the only way to really determine what's good for you is to extensively use the different types of barrel. yes, but im not married to it Link to comment Share on other sites More sharing options...
BigBets Posted April 15, 2011 Share Posted April 15, 2011 Not to get too off topic but I think this applies. Can you tell a major difference with a properly adjusted JP block and low mass carrier vs. a rifle legnth gas with a regular bolt carrier group??? Link to comment Share on other sites More sharing options...
RiggerJJ Posted April 15, 2011 Share Posted April 15, 2011 Not to get too off topic but I think this applies. Can you tell a major difference with a properly adjusted JP block and low mass carrier vs. a rifle legnth gas with a regular bolt carrier group??? Short answer; YES! Definitely YES! jj Link to comment Share on other sites More sharing options...
bkoenig Posted April 16, 2011 Share Posted April 16, 2011 I like my 18" WOA SPR barrel a lot. It's a little bit heavy but I think that helps me hold the rifle steadier. It's very accurate, too. I haven't spent a lot of time shooting it from the bench but 75 grain Hornady OTM's are right around 1 MOA. I'm sure with more tweaking I could get those groups a lot smaller but I haven't put in the load development time. Link to comment Share on other sites More sharing options...
DanielW Posted April 20, 2011 Share Posted April 20, 2011 Im trying to decide if Id rather have the extra weight of a woa 18" vs a nordic 16" middy with little more recoil, but lighter weight.... FWIW I have the Nordic-Lilja; very impressed indeed. Beautifully machined; shoots way better than I do. Competitive price too (especially with the coupon for Brian Eno's members) Link to comment Share on other sites More sharing options...
diversmith Posted April 23, 2011 Share Posted April 23, 2011 Not to get too off topic but I think this applies. Can you tell a major difference with a properly adjusted JP block and low mass carrier vs. a rifle legnth gas with a regular bolt carrier group??? Short answer; YES! Definitely YES! jj I'll second the "definitely yes" Link to comment Share on other sites More sharing options...
MarkCO Posted April 23, 2011 Share Posted April 23, 2011 Not to get too off topic but I think this applies. Can you tell a major difference with a properly adjusted JP block and low mass carrier vs. a rifle legnth gas with a regular bolt carrier group??? Short answer; YES! Definitely YES! jj I'll second the "definitely yes" There is NO definately on this subject! It all depends on the variables. IF you have a typical barrel with a honking huge gas port, then an adjustable gas block, properly tuned will cut some recoil. Barrel length and gas system length is a factor as well. Generally, the shorter you get in barrel length and gas tube length, the less adjustable gas helps. There are a scant few AR-15 rifle barrels made with gas ports on the small side. It also depends on your powder/load. If you run a 55 grain FMJ right at the minimum PF level for USPSA, then adjustable gas won't give you much if anything because you have already reduced the gas volume by using a properly tailored load. Also, adjustable gas is more prone to cycling issues when fouled so they do require more maintenance. No matter what, the JP Low Mass carrier will cut recoil. Link to comment Share on other sites More sharing options...
RiggerJJ Posted April 23, 2011 Share Posted April 23, 2011 *%ing engineers... Thats why I said "short answer, yes".... JJ Link to comment Share on other sites More sharing options...
mpeltier Posted April 24, 2011 Share Posted April 24, 2011 Not to get too off topic but I think this applies. Can you tell a major difference with a properly adjusted JP block and low mass carrier vs. a rifle legnth gas with a regular bolt carrier group??? Answering this question exactly.....is YES. To be more specific, if you take a standard AR15 rifle gas system, with A2 flashhider and standard buffer and spring and compare it to a fully speced out JP LMOS operating system witch includes the light bolt carrier, adj gas block, JP spring and LMOS buffer, and with compensator, there is really no comparison. The JP system is going to be remarkably softer shooting. But it is a system. Replacing one or two things is only a piece of the puzzle. And properly adjusted,and maintained, I have found it every bit as reliable as a stock AR15 set-up. Link to comment Share on other sites More sharing options...
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