302w 83 Posted July 16, 2014 Silly question, but is a standard x39 barrel the same externally as a A2? I would like a 16" midlength x39 barrel to use with a 16" A2 birdcage and A2 front sight with perhaps an A1 sight post. I've read that some x39 barrels are 1/2" threaded for muzzle devices and some are 5/8", while standard 556 is 1/2". I'm looking to build a PA carbine. x39, MOE furniture, 16", bayonet mountable. I would consider 5.45 over 7.62 if 7n6 was still being imported. Quote Share this post Link to post Share on other sites
NYMetsFan86 9 Posted July 16, 2014 not positive about the profile but i have gotten all my x39 parts at ardepot.com and sotaarms.com you can always contact them first Quote Share this post Link to post Share on other sites
mipafox 438 Posted July 16, 2014 Aren't you going to end up with an odd trajectory vs. point of aim? Quote Share this post Link to post Share on other sites
302w 83 Posted July 17, 2014 Aren't you going to end up with an odd trajectory vs. point of aim? Probably. I believe a scope would be overkill and I like iron sights anyway. I really don't know what sights to use, but since I live in PA I would like it to be bayonet mountable with an A2 fsb. Quote Share this post Link to post Share on other sites
NYMetsFan86 9 Posted July 17, 2014 i was nailing steel at 200 2 weeks ago with my x39 standing. trajectory didnt seem all that off Quote Share this post Link to post Share on other sites
mipafox 438 Posted July 20, 2014 i was nailing steel at 200 2 weeks ago with my x39 standing. trajectory didnt seem all that off You have AR-15 A2 front sight on it? Trajectory doesn't mean accuracy. Most MSRs have sights of a specific height that allows them to shoot relatively flat over a given range (point-blank range). You change that height and you have to adjust elevation of point of aim over the point blank range. Quote Share this post Link to post Share on other sites
NYMetsFan86 9 Posted July 20, 2014 You have AR-15 A2 front sight on it? Trajectory doesn't mean accuracy. Most MSRs have sights of a specific height that allows them to shoot relatively flat over a given range (point-blank range). You change that height and you have to adjust elevation of point of aim over the point blank range. Front sight folded down, primary arms red dot only. Was zeroed at 100. Im not very experienced with sighting things in yet so I was kind of just "Seeing if I could hit it." Was a 12×20 plate so not to difficult anyway. The bullet did not seem to drop between 100 and 200 Quote Share this post Link to post Share on other sites