chainring Posted June 4, 2012 Share Posted June 4, 2012 (edited) DISREGARD, SELLER LINKED THE WRONG BARREL. I'm picking up a JP15 upper that is a 16 inch barrel, with the rifle length adjustable gas system on it. The lower for which it is destined has a collapsable stock receiver extension on it. Should I plan on putting a Vltor A5 kit on it, or will the adjustable gas block enable me to tune the rifle length gas to work well with the short receiver extension? I would normally just play with it when I got it, and see what works - but this is a surprise upgrade for my sister (she shoots an aesthetically identical Smith and Wesson VTac upper right now) and I need to be able to upgrade her rifle and adjust it to perfection over the course of a holiday weekend before she leaves. She's not technically oriented and has little patience for malfunctions or "finicky race guns"....if I don't get it right and she has problems during a match with my super-fly upgrade to her previously reliable system, then she's going to be chapped! So... ..buffer weight? ..A5 kit? ..just shoot it on my similar lower with the ammo she uses and tune the gasblock? ..fresh buffer spring? JP spring? Any tips would be appreciated. I need to get it right the first time. Thanks! Edited June 4, 2012 by chainring Link to comment Share on other sites More sharing options...
michael1778 Posted June 4, 2012 Share Posted June 4, 2012 I didn't know JP made a 16 inch barrel with rifle length gas. Their current JP-15 Upper order sheet shows only mid-length gas for a 16" barrel selection. Besides that, I'm afraid I don't have anything to add to your host of questions. Sorry about that. Link to comment Share on other sites More sharing options...
MickB Posted June 4, 2012 Share Posted June 4, 2012 You're sure it's not an 18" barrel with rifle length gas system? or maybe it's a 16" with mid length gas system? Either way, you are fine with the standard carbine receiver extension and standard 3oz carbine buffer. That's how my complete JP15 came set up. Mick Link to comment Share on other sites More sharing options...
chainring Posted June 4, 2012 Author Share Posted June 4, 2012 Here's the link for the barrel that he posted: http://jprifles.com/buy.php?item=JPSM223-16L8K Says 16 inch rifle length. [/uR Link to comment Share on other sites More sharing options...
ken hebert Posted June 4, 2012 Share Posted June 4, 2012 Looks mid gas with rifle handguard Link to comment Share on other sites More sharing options...
chainring Posted June 4, 2012 Author Share Posted June 4, 2012 (edited) Believe you are right. He linked me the wrong barrel. Edited June 4, 2012 by chainring Link to comment Share on other sites More sharing options...
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